On Feb 22, 2023, at 9:30 AM, Wilko Bulte <wkb@...> wrote:

?Although much better now that the relays have been resoldered, the problem is not completely gone yet.

It now takes approx 2 to 3 minutes from a cold start before the problem disappears, that was more like 10-15 minutes before the rework was performed on the relays.

So, I suspect there are some more, and likely similar, soldering issues to be resolved. The input hybrid runs very hot, its heatsink one can barely touch. Maybe the hybrid's socket has become temperature sensitive? I am a bit "chicken" about removing the hybrid, given its unobtainium status..

Wilko