A couple days ago I noticed that HAM3 HEPI H4 L4C had almost 0 signal compared to the other L4Cs on that chamber. I didn't have time until this afternoon to look at it. L4C proof masses can get stuck (or something) so I tried waking it up by tapping on the L4C casing or (gently) slapping the locked crossbeam. Neither seemed to work, so I powered off the interface chassis on the pier, and swapped the cables between the H4 and V4 L4C. This seemed to work. The H4 L4C still worked when I swapped the cables back. Probably need to watch this down the road, maybe think about adding a famis task to monitor, because this is the second "stuck" L4C I've found on the IMC HAMs.