DML939

My car is currently at my mechanic getting the starter replaced and a few other things but before I took it I replaced the front air bags as they had a leak. Since the car wasnt running i could really test them so i asked him to do it. He brought the car inside and left it over the weekend in lift mode and it didnt move at all. He then drove it outside in the morning and reverse parked it up hill. When he went back out alittle while later the front end had dropped. When we start the car it throws the yellow and green suspension lights and will say leak detected but once you clear it, itll pump back up like normal and be fine. I am not sure if it could be a leak because it didnt drop at all over the weekend. Could this be an electrical thing or a sensor causing it to purge the air?