I bought my op-1 with the same issue, the previous owner had dropped it with a cable in the headphone jack, and it ripped the jack off the connector board. I’ll dig up my post about fixing mine, but I reached out to TEs customer service and they were able to provide me with a one time link to purchase a new Connector Board (what handles the input, output and USB), relatively easy to replace even if you have no experience I’d imagine.