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Anecdotal, but the guy who fixed our boiler was adamant that old boilers were much better quality than modern ones.
Define quality. Old boilers are far simpler in design because they weren't required / regulated to be mind bogglingly efficient and installable by a single human even if needed to be carried up four flights of stairs.
Do find it kinda unforgivable that appliance PCBs randomly die though.
Anecdotal, but the guy who fixed our boiler was adamant that old boilers were much better quality than modern ones. So it might not be a good idea to remove it until its beyond repair.