And when folks jump on the bridge mantra first, guess what? A lot of the time it fixes it!!!! Why? Because (drumrolll please) they had to remove the power supply to change it and they had to unplug and reseat connections! DOH!

My mantra is more of a game is intermittent, is power supply a 35 year old virgin? If yes rebuild caps. That gets two variables out right away, caps and connections. If it is still intermittent after that, or if the supply looks to have been rebuild at some time, THEN I walk the pinwikki tree like it is gospel. Most times its faster to recap as it needs it anyway, pay me know, pay me later thing.

Correct. I only target the power supply. +/-100V, 5VDC and !2V filters caps. 4 or 5 total.

Could be co-inky-dink but it's always a good rule of thumb to have all screws in place and tight. Normally loose screws manifest itself as a 'hum' in the speakers. It really makes a difference in sound cards as you will tend to hear a lot of hum on poorly grounded boards.