Work is progressing slowly here, much of my time has gone in researching for suitable parts.
So far here is what I have done in the power supply board :
Replaced the C1439/A858 with C4027T/A1552T tried to match those. I
I used MJE15030 that I had in hand to replace the C1624
2 more transistors C1775A/A872 were replaced with C2240/A970
4 1S1885 diodes with 1N4007
Still waiting for the Zeener diodes to arrive, 2 X 3.3uf/100v film caps and some resistors.
Thinking to put mica caps in place of the 4 X 47pf ceramic caps
Then ideally the trimers for adjusting the +/- 85 v which are tricky because need to be accessed while the board is in place.
there is only about 6mm space on top of the board so not sure anything can fit on top. If someone have knowledge of any trimmer pots like the original that are accessible on both sides please let me know.
Not finished yet but here is some pics of the board.
I tested it in place for a few hours today without issues