If you are still wanting a CPU board, I have several 8753's (most of which are 75Ω, but the CPU board is the same) and if you like, I would be glad to copy the EEPROM (which includes the correction) over to the new board too, offer me a fair price and I'll let you know.
p.s. no idea if they are the newer processor board or the old one, if you are still interested in that I'll have to check on that first.
Best regards,
Trent Spencer - KM4YTU