A very interesting account of the history of the set. The capacitors you mention I believe are mixed dialectric. I had a few problems in my VC205 with the frame, but the condition was of a permanent nature until I replaced the capacitors.
I agree that they are excellent sets capable of the finest pictures.
Here is the story of mine...
https://www.radios-tv.co.uk/communit...tvs/itt-vc200/