Original post by: Philip Le Riche ,
The symptoms would certainly lead me to suspect bad caps. The fact that an electrolytic capacitor looks good is no guarantee that it is good. They’re cheap enough - just replace them all, preferably with ones with the next higher voltage and temperature ratings. (Make sure you solder the replacements the right way round.) Meanwhile you might like to invest in one of those cheap Chinese bare board ESR testers you can get on eBay and test the ones you take out, just as an exercise.