Quoted from Robl45:So maybe try being helpful, which traces would I check to confirm it can access the PIA?
I see at least two other posters who have offered you this advice in this very thread and also some writing comments that make it clear they are exasperated by your responses basically ignoring their advice. I picture them banging their heads against the wall when they read your responses to their comments.
So I will recap the advice that you have already been given by others:
With the power OFF and preferably the board on the work bench, using a multimeter (preferably set to 'beep' for continuity) grab the schematic and measure each and every trace that connects EVERY pin on the PIA socket to EVERY other place on the PCB. Sometimes this might be two, three or more connections to other places for each pin - check them ALL. Yes, this is a time consuming job and could take 30 minutes or more. That's one reason board repairs cost more than some expect.
If any one of the pins on this 40 pin chip isn't connected correctly, as the circuit was designed originally, the software will 'flag' the PIA as 'bad' because it can't access it so it could be ANY single pin from the PIA that causes the exact same response from the program EVEN THOUGH there may not be a single thing wrong with the part.
This is what any good tech would do in a situation like this because it's a well known issue with most boards from machines of this era.
If you don't know what is meant by this method then you most certainly should not be playing around with this board that is delicate and very easily damaged. Changing sockets, for example, often causes many more problems than it resolves.
Best of luck with it.