Hi Randy,
Psionic Audio did a really nice review and fix of PS-2A about a year ago and also found it highly repairable. https://www.youtube.com/watch?v=MCYJLaAbx2I
If you are undertaking that independently, then fine, just be aware that we don’t support end users on repairs (safety concerns and also it takes up too much traffic going back and forth, where as a skilled tech will just open it and fix it). I think reflowing the solder is generally enough, and a bit of cleaning with Deoxit is OK. Take a look at this success story: Chasing the Volume Drop: Faulty Connector Found - #6 by Bobman34