You may want to try checking to o/p drive transistor? (Cheap easy to get)

There are only a couple of electrolytic caps on board by memory and they are usually ok, infact they are probebly better than some of the new smaller versions event the 105 deg ones from the likes of rubicon etc. They are cheap enough I would just swap them, f you don't have an ESR meter.

As I said I have hane alot of bad experience with the dirty leads on the poly and plastic tantulum type caps, some of these are aranged in a charge pump type cct that stores a voltage to compare against as a reference and some would be used to change the pulse width of op drive. So they are quite crytical.

There are only a few IC's on the board and they are easy to get and have the type numbers printed on the top (most manufacturers remove them), so you could swap them for only a couple of dollars and save yourself some time. Unlike me who traced most of the circuit out just to torcher myself ha ha.

Good luck

Damian