Marshall Valvestate 80V Clean Channel Dead

[Lunchbox21]

Progress but...

I replaced IC2 with a new TLO72

This brought the clean channel back. Both CLEAN and CRUNCH mode working.

However the volume pot is not working. The volume level is constant, the volume pot dialing from zero to 10 changes the sound slightly from bright to muffled, no effect on volume.

Also after fiddling around for a minute it seemed like the sound was starting to become distorted and the volume level was fading. I shut it down.

Before this I verified the volume pot was working. When signal tracing I could change the level of the signal using the volume pot when I listened at C3.

Gain channel is working fine.

Can you relate to the following issue that I am having right now? and did it got solved by changing the IC2 with TL071?
https://music-electronics-forum.com/...el-not-working