"Arfa Daily" wrote in message
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snip


Are the 330pF multilayer ceramic that could have metalisation creep /
cracks/ unreliable /leaky from humidity. I would replace them with a
different brand/construction



It would probably be worth doing some further checks on those caps to make
sure that they are not any part of the problem

The low capacitance, high voltage disc-ceramics sometimes used for flyback
tuning in TV LOPT stage have been known to fail, ut its usually visible.

Sometimes the ceramic disc cracks and is usually visible because the resin
dip also cracks with it, sometimes they track around the edge of the ceramic
disc and burn a little "volcano" through the coating.