Pioneer car CD player model:DEH-46DH need audio output IC #

Pioneer 45Wx4 detachable faceplate car CD player model:DEH-46DH,year:unknown.This unit is a GM/Chrysler fit model (double DIN size) where customer paid $700 new when he bought it several years ago.

He has not yet brought in the unit but it has no audio output and I assume the audio output IC is defective,I need the part # (Pioneer & generic & NTE) for it as the sites below and Google searches comes up nothing.Thanks in advance for help/replies.

These part # lookup sites:

Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova scotia Canada