International Business Machines, or IBM were the uses of
Computers. Business Machines like copiers, type writers, fax machines were with a professional look. Very expensive equipment that required field service and on site repair. Component level PCB repair was when no replacement was available. You know the look of a worked on PCB and a micro sized one today. Just swap it out to illiminate the problem completely if possible.
Louis Rossman has been repairing PCBs that have had
a soldering defect and reported to Congress these findings, but he does not make enough profit today. Just swap out a PCB if you can. Surface mount technology is difficult, but a heat gun and a little flux and solder paste mixed with solder powder, can work miracles.
The worst thing to find is a PCB that has been over worked on by someone who thought components needed to be replaced and the PCB has the copper traces all pulled off.
We used to have a more professional look with NO hippies allowed. Clean cut with a shirt & tie.
A gaming computer is sort of a good Work Station that is needed today. A work station computer has good performance and would need to only have some one professional like you involved and no beatnicks or hippies need apply.
Good luck to you. If you can repair a power jack, you should be good for Office Equipment and Business Machines.