Dave,
Thanks for the write up. Did you disconnect the delay line as mentioned in the manual? I may have to pull the board after all. One of those capacitor blocks that are plugged in seems to have a bad contact. I have cleaned the delicate switch contacts and they seem ok. The test signal looks funky on CH2 and if I put slight pressure on one corner of the 10x block, it becomes normal. I tried removing it and cleaning the 6 pins but it does not seem to be fixing the issue. It goes back to the weird wave form if you tap a corner with anything. If I try to wiggle it, it comes back ok. It may be the tiny socket that holds one of the pins is loose. Or it may be the inside of it is tarnished.
I remember someone on EEVblog mentioning that he had to slightly flatten the pins for a better contact. He even mentioned how he cleaned the inside but I cannot remember what he had written and now I cannot find the thread. I will post there and see how it goes.
Ananda
