So i had my amplifier repaired recently because it had some water problems and it kept cuting out the bass and after i cleaned it my self it kept getting worse,took it to some place and repair some of the traces that i ripped off after i took it from the repair shop the problem is the same ,keep cuting the audio and i lose the power in the subouffer then it comes back it keeps cuting sometimes ,the volume resets sometimes and the AC measurement dissapears from the display.I have an 8T0035223AN any idea what i could do? I hear a speaker that is going bad i think cuz at high volume some songs sound very wierd on the right side not all but like 1 or 2 songs that i listen too ,so i think because of the speaker the amp get s very hot and it dosen't let the fan to kick in maybe?

 

If you've had water damage and broken traces...it really may be best to gamble on a junk yard or ebay replacement for the whole module.
That should solve everything at once in way less time that trying to check every connection on the board, but if you have a magnifier and can scrutinize every solder joint, sure, have at it.
The speakers are easy to isolate and test. But unless you've been blasting the volume, odds are it is just the "board" and possibly wet corroded speaker wire connections at the board.

 

8T0...AN, so it's a MY10-MY12 A4/A5 with MMI 3G (navigation) and B&O sound system. Those are pretty common, a lot more than the 8T0...T in my MMI 2G MY09.
If a place can properly repair it, go for it. But probably just as easy to replace it. https://www.ebay.com/itm/398045034304 The one tradeoff there is a replacement then requires the component protection to be reset. So a dealership or shop with ODIS that can do it as cheaply as you can find. A shop half hour would be a lot less than a dealership if the dealership charges a 1hr min. The task probably takes 10 minutes max.
As for what's actually wrong with the amp, who can know. Especially remotely.
Are the audio issues only with the radio source, or also other sources? Because the radio unit is right below the amp. When my amp got nuked by water from the sunroof drain coming down the headliner (you'll notice it's shaped to drop the water off right into the fan opening on the amp), I only needed to bother with the amp; the radio was fine.
In my case, the left side audio plays without resetting the CP, so I just listen to it like that. Not worth $160 or whatever and an hour trip to the dealership just to reset that. If something happens and I can just toss that in on some visit, sure. Otherwise, I have a different long term plan that'll remove the entire entertainment stack in the left rear (because I'm MMI 2G; wouldn't be feasible with MMI 3G).

 

It was so much simpler when every car sold in the US was REQUIRED to have a standard DIN or double-DIN radio and Audi typically had Blaupunkt. (I think Blaupunkt went bankrupt and some Chinese company uses the name now.)

Dealer programming hurts. But in the US, 2G was (they swear) discontinued years ago and even though US 4G (not the same as worldwide 4G, which is called 4GLTE here) is actually 3G with fast tower connections...3G was supposedly discontinued here too.
So installing a new 2G or 3G anything is a painful thought.

DIN standard sizing made life so much simpler! Sometimes I get tempted to cut a nice double-DIN sized hole in my dashboard and do what Audi should have done!

 

That's actually the plan for my MMI 2G (no reference to cellular). That has the CD changer above the climate controls, as the MMI control module actually sits behind the climate controls. So with the CD changer out, the AMI unit in the glovebox out, and the entire stack in the back left out, I can just do a point to point optical cable from the J523 to the J533 gateway. Then it's just a matter of mounting the single DIN unit where the CD changer was. Can still go RSNAV for a screen upgrade. It's just too bad the current aftermarket units look so bad. HD Radio (which wasn't factory until MY11) is hit or miss in the aftermarket. Kenwood, which is what I used since the KRC-930 back in high school, has this crappy 80s calculator font on their stuff, which appears to just be a rebrand of the same Chinese pieces that Pioneer is sourcing too. It's a sad situation out there. Can't go with the pop out screen stuff since it would be right in front of the vents. And nothing has a remote screen support.

I got away from the aftermarket config when I got my G35, which had that integrated setup with the climate controls board. Took too long for Metra to finally work out a mounting kit. And what things are out there these days as factory upgrades appear to all leverage iDatalink Maestro, which just happens to not support our vehicles.

Should be standard form factor and standard bus interface. But we see where it all went. Proprietary control. Now Audi has an app store in the car, and you can spend money to buy virtual cockpit themes. The sad part is average people today probably thing that's a cool thing.

 

If you can squeeze a DIN into the disc cutout...please please do post the results!

I cheat, I use a Trimble GPS in the lower left of the windshield (above the air vent) or Velcro an older smaller Garmin (which can call POIs on my phone) right over the AMI display. Oth with lifetime maps and quarterly updates at no extra charge.
(That is what the basic orange display is called, yes? AMI? Or is that what the glovebox plug is called?)