We know that batteries and capacitors leak and destroy tracks on the motherboard, so we must replace them with new components, how long will equivalent parts be available?
We know integrated circuits suffer from "silicon rot" which renders chips non functional after 10 years or so, so we are lucky our custom chips still work, there is a limit to how long an amiga with original components will last.
I am now starting to hear that lead free solder has problems, products failing after 4-5 years. so repairs should use leaded solder if possible.