Amplifier draining battery

I have a 2005 Chevy Avalanche with a parasitic draw. I have it narrowed down to the factory bose amplifier and had already replaced it with no change in the current draw. I had disconnected the radio and no change as well as the rear seat audio controller, with no change. Any ideas out there? Would anybody have the pin layout for this model? I am pretty sure it is the premium sound with rear entertainment. 20 pins are used in the harness I pulled. How would I be able to test this at the harness?