I should have started this topic with the model so people can find it...
The backlight can be brought back to life with 4 Kingbright APT1608LVBC/D blue LEDs. It's fiddly but worth it, it looks new.
The pushbuttons becoming very hard to register a push is solved by replacing them with Schurter 1301.9302 tactile switches.
The rotary dials becoming fiddly is solved by spraying a small amount of Nu-trol control cleaner into the switches.
Not electronics related but the door spring can be replaced with a generic tension spring as found in this kit
https://www.dormanproducts.com/p-7784-59001.aspxUse the second strongest one but make a 1 inch long extension otherwise the door is far too strong. It will slam into next week without an extender... If you use a weaker one the door won't be able to push the rack back in.
Another item rescued from the trash. And now to toast some English muffins!