did you change all the caps?  if not you should. they can fry inside and lose connection, and can still look nice on the out side.  at least all of the 1000uf's 2200uf's  220uf.s 470uf's at a bare minim, also the AC filter caps… those are known explode at random times and give smoke off like a smoke bomb, can be really nasty. So changing those X2 Caps is a good idea.