Looks like my UMC is on it's last legs. A few times previously the car would state "check charger power" with the UMC inserted and energized. A couple of times reseating it helped. Cleaning out the connector seemed to have alleviated it for a bit. Two days ago the car wouldn't recognize it no matter how many times I reseated it. Finally I gave the UMC body a hard rap, and the light on it went red. I reset the breaker on the bottom, and the car saw it. Yesterday it wouldn't kick in regardless of how many times I tried that trick. Trying additional known-good outlets didn't help. The fact that cleaning the connector contacts seemed to help makes me think it could be a flaky contact at the car-end of the cable. However, the fact that rapping on the body helped makes me think it may be an internal fault. Q's: -Has anybody successfully opened one of these up to attempt repair? (or are they all epoxied up?) - Any sources for just the UMC without the bundled case and connectors? I have all of those. Thanks.