I noticed that the RMTEMP channel was spiking myteriously when Kiwamu opened the PSL door. We found out that the LEMO connectors would intermittently short to the case and cause ~1 deg steps in the temeprature.
We have removed the case and examined it. Not only were the connections to the box intermittent, there was a cold solder joint inside on an unsecured flying add-on opamp. The whole thing is a giant hack.
PK was the last person to work on this box, but I'm sure that he wouldn't have left it in this state. Must be gremlins.
The LEMO connectors on the front are the ones touching. The LT1021 is the badly soldered part.