b52k1s4

Hi Guys,
Lately I've been experiencing some power loss in 4th and above. Its very noticeable but not rough or sputtering. My initial thought was turbo leak somewhere in the plumbing. After doing some research I'm not convinced. Can anyone provide tips or advice for the best way to start troubleshooting? FWIW its an 01 with 231k. I replaced the timing belt about a year ago and was fine until a few weeks ago. Any input is greatly appreciated.
Thanks!

b52k1s4

I pulled the codes with VAG-COM. Based on the output and forums searches it looks like the EGT might be the problem. here are the codes I pulled.
17861 - Exhaust Gas Temp Sensor 1 (G235)
P1453 - 35-10 - Open or Short to Plus - Intermittent
17964 - Charge Pressure Control
P1556 - 35-10 - Negative Deviation - Intermittent
17585 - Bank2: O2 (Lambda) Correction Behind Catalyst
P1177 - 35-00 - Control Limit Reached
16543 - Oxygen (Lambda) Sensor B2 S2
P0159 - 35-10 - Response too Slow - Intermittent
17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 35-00 - System too Rich
17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 35-00 - System too Rich
17883 - EVAP Leak Detection Pump
P1475 - 35-10 - Malfunction / No Signal - Intermittent
17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 35-00 - System too Rich
17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 35-00 - System too Rich
17864 - Exhaust Gas Temp Regulation for Bank 1
P1456 - 35-10 - Limit Reached - Intermittent
17870 - Exhaust Gas Temp Regulation for Bank 2
P1462 - 35-10 - Implausible Signal - Intermittent
17947 - Clutch Pedal Switch (F36)
P1539 - 35-10 - Implausible Signal - Intermittent
I think my next step should be to log while driving, does anyone know which blocks I should focus on?