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Yes, I'm trying to follow those steps but it is not locking at all. I was able to do it fine with the set on its side, so I do know how it's supposed to go.
All signs point to a loose connection but I have not been able to locate it; everything I ohm out seems OK.
Perhaps it is not a completely loose connection but a high-impedance one instead; that would explain why I can't find anything checking resistance but it acts up without fail at 15 kHz... that's gonna be tricky to find.
Am I right in thinking that it's the horizontal waveform coil that creates that double-hump shape? If so, perhaps that's the place to start looking, you can see it goes away leaving only the horizontal drive sawtooth sometimes when tapping.... perhaps that coil is going open circuit.
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