Sony KV-X2962U TV?

This set has a history of shutting down. The fault gradually advanced to include frame 'fold-over' and the display of three single colour lines. Finally, the frame collapsed to a small momentary line scan at the top of the screen.

I have four years to go before they turn our analogue TV off, in the meantime, it would be great to continue watching this lovely TV,
excellent when working properly.

Yes, I am frantically trying to acquire a Serevice Manual.

I should mention the whole unit has been thoroughly cleaned with Isopropyl Alcohol and shows NO sign of component distress.