I believe the power amplifier in my '93 9000 CSE has a noisy
transistor...it is making a hissing/popping/crackling sound, even when
I remove the radio and cd player units.

This is under the passenger's seat, I believe. Is there a way to
determine the Clarion part number for it without removing the seat? I
want to try to order a schematic from Clarion...

Thanks for any info.