IIsi weak sound volume, can anyone here narrow down the caps needing replacement?

[DaiyuHurst]

Hi folks,
I have one complete IIsi and another with a dead PSU, but both exhibiting very weak sound output
(of course, I have to swap in the good PSU for the one). Can anyone here narrow down which caps need replacing?

Dai

 

[finkmac]

have you replaced any of the mainboard caps?

is the "good" power supply recapped?

 

[DaiyuHurst]

have you replaced any of the mainboard caps?

is the "good" power supply recapped?

I doubt any of these bits have had any love - they were eBay purchases. At least they didn't experience battery rot.

I have a third board that's dead as a doornail.