I bought a used OP-1 from a seller on Craigslist. Everything seemed to be in fine condition until I really started to use it at home. The headphone jack kept dropping out, and I realized the scratch on the side of the headphone jack was more than cosmetic. The connection between the output port and the connector board was damaged.
The most difficult part of the repair was removing the cover panel for the board. It took a while to create enough play with the jimmy to lift the cover off without damaging the finish on the casing. Thankfully the replacement board comes with a replacement cover, as the jimmy does a pretty good job of gouging the cover up.
It's goes pretty quickly, and is quite easy. A few things to note: only one of the screws has a washer on it. That isn't entirely clear from the instructions, but makes sense. To remove the board, push in on the external connectors. It will loosen the board and allow you to lift it out.