[oldticktock]

I've nothing much to add but perhaps an observation, I thought that if there was low EHT this would result in a overly large raster and that you do not have. Your raster is reduced in both directions, perhaps voltage checks throughout the circuit should be made and verifed against service data. Most likely one of those misleading faults that provide so much frustration.

Do you have a copy of the whole circuit you could post, it may help us all to visualise the problem better.

Chris