An interesting question. If you have a module of the same age, I don't see any problem with a module swap. That's what I do, but my modules are probably logically rather smaller. One printed circuit board holds one 3 input not-J not-K flip-flop. Another type has four And gates. When I eventually run low on spare modules I will have to start component level repair, hopefully being able to make 3 good modules out of 4 bad ones. You are probably wondering what computer I have, it is made of discrete Germanium transistors and diodes, has 2000 words of 48 bit core store, drums of 12000 words, half inch ten track magnetic tape at 300 bit per inch, card reader, card punch, line printer, paper tape reader, and a slow, more modern (BRPE) paper tape punch. It is an I.C.T. 1301 mainframe, first installed at the University of London in 1962 to handle administration, undergraduate matriculation and statistical analysis of exam results and allocating candidates their grades and printing pass slips. It weighs many tons and consumes 13kVA of three phase electricity when everything is running at the same time. In service it was normal to swap a complete PCB and send it back to base for repair. These would be repaired to original specification, going as far as going though quality assurance where they would test each soldered joint and apply a dob of red lacquer to each joint to show it had passed inspection.