Looks to me like it was soldered on by the original owner. What do you mean, "lift the ground"? Would that be running a ground wire from the board case to the ground prong on the cheater plug?

BTW I know that it needs to go to the shop but I'm considering returning the board to the previous owner for refund since I can't be sure I can limit the fix to under $100. For that kind of money I can get a different board in better condition. I love bringing things back to life but not sure I can justify the expense in this case.