Hi Stuart,
sorry for that. Keep searching for them, something may come up. most people do upgrade these machines to new electronics.
I would not worry too much as it was working fine for 25+ year - quite reliable and also because of the age, repairable for electronicaly minded person. capacitors are most likely to go. If you find the problem, these are easy to fix.

If you need any help or advice feel free to contact me.

Martin