mid 1990's fender ultra chorus issues

[gregmagill]

HI all. First post here. I believe i'm in the right place.
I have a mid 1990's Fender ultra Chorus with 2 12" fender speakers.

I am having a lot of issues with both channel volume controls: It pops a lot and goes in and out all the time. I had serviced a couple of years ago and it seamed to work well, now I am just trying to salvage it. Could it be bad solder on the board?

[Enzo]

Yes possibly, but my first suspects will usually be dirty contacts in jacks and connectors.