Hi, I am new here but I was wondering if you could help me, I have a problem with my peavey bandit 112 transtube (produced around 1994)

This first happened halfway through a rehearsal. When playing, the volume suddenly jumps really loud and stays maxed out regardless of where you set the volume. This happens on the clean and dirty channels and independently of each other.

I am guessing it's the pots because (and I'm not a fan of doing this) by twiddling a bit with the knobs (pushing and pulling) you can usually get it back to normal.

So my question is, would this require replacing the pots? They are both square and braced (I'm afraid I don't know the resistances).

Clean Volume labelled (on the PCB) as VR1 Volume
and on the pot as:
I d
A254

and

Dirty Volume labelled VR9 Post Gain;
I d
B254

I'd appreciate any help!