HP21 Are replacement ICs available?

[elanman99]

A old friend has had an HP41 from new and after not using it for the last 20 years tried to operate with the charger but without the batteries present. My understanding is that this damages the main IC at least.

I have searched on this forum without success to see if anyone has cloned the IC's. Am I correct in assuming that the only repair method is to find a scrap calculator (with a different fault) to make one good machine out of two faulty ones?

Ian