My advice is download the schematic from this link below... Look for post from Stratorius for the Schematic info then go right below his post and READ ENZO's post. Now we can assume you completely removed all the solder from the joints of the main Filter caps... I hope. Just reflowing the solder may not be enough... If not do this now as it points to loose solder joints on the caps. Change the caps too as they are nearly 25 years old.>>> But this might be the link you were looking for too.??>>>
http://www.ssguitar.com/index.php?topic=1673.0
http://www.ssguitar.com/index.php?topic=1673.0