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#2455
Barry
Keymaster

The F font appears correct and while that won’t rule out a bad transistor at least it is a Fairchild. The problem Is occurring before that final stage anyway based on your report.

I suggest reflowing everything including all wiring and if that does not help replace the other transistors or even better use an audio probe to locate the problem area more easily.

https://guitarpcb.com/wp-content/uploads/2018/08/Audio-Probe-Explained.pdf