Yes, that looks like the right part. Digikey calls it "Power Barrel Connector Jack 2.50mm ID (0.098"), 5.50mm OD (0.217") Panel Mount". I looked at the CP3 today and it seems it will be a bit of a task to unmount the various parts to get to the solder connection for the connector. Maybe this will wait until it breaks. Also a call for instructions to AP might be in order.
