There are 3 in-vac thermistors mounted to the OPO. The first one is read through the TEC controller and works fine. The other 2 are reading zero Ohms. The wiring is correct up to the Squeezer EtherCAT chassis 3, indicating it has an internal wiring problem.

The Peltier heater works too. The controller parameters and loop shape were imported from LLO, and the servo works in-air.