i have a lot of zpa's, and personally recapped them all, cleaned them all out, etc.......
unfortunatly also i had experiences what little copper wires can do
stripping a wire 20inch away from the amp, can result in a burned amp !!!! the fans are
powerful enough to suck it up from that distance...... please solder every wire before you
come closer to the amp.... i even use banana plugs for speakers and remote !!!!!
please open the amp until EVERY transistor is visual and check under good light,
under and aside every transistor or place on the board....sometimes they hide themselves very good....
for me this is standard work if i get another zpa from somewhere........
good luck !!