Ok then... The capacitors have been replaced. How "new" the capacitors are I cannot say because Randall keeps them as inventory and I don't know how "fresh" they may have been. I've received stale electrolytics from suppliers before that performed so poorly they needed to be replaced. So.?. The filter grounds are said to measure below 1 ohm. Though I don't know at what points they were tested.
Are we still suspecting higher than normal inductance in the power supply then? I have some considerations.
Is it possible, Randall, that the caps you installed were not entirely fresh (be honest now )
And Helmholtz, is it possible for that to make a difference of increased inductance? Considering the physical/mechanical structure I wouldn't think so, but I don't know. And...
Is it possible then that if the caps were a little stale that they are now charging and breaking in and that would lower the inductance? This might explain why Randall hasn't been able to recreate the problem in a while.
Just thinking out loud.