And, if it doesn't, there simply will be a day when you have to let go. Your Beolink 1000 has served a long and useful life. It'll be like 150 years old in plastic remote years
These can be repaired on component level to some extent (I think there's even a schematic somewhere), but if for example the custom microcontroller that is the "brains" has died, there's nothing you can do. It'll be time to get a new remote from fleaBay or something, and keep the good parts of the dearly departed for some future mechanical spare part needs.
If you see any traces of moisture or corrosion on the circuit board, it might be revived with a proper cleaning, otherwise I simply would not bother.