Late entry from yesterday. 

The AC power for the Kepco high voltage supplies (provide ±430V to the LN ITM ESD Driver) were connected through the safety interface chassis D1400047. Interlock enables/disables the high voltage power supplies. The safety relay is controlled by the output of the Inficon guage installed on BSC7.

The positive high voltage supply was also replaced. Unit was found tripped and even after power cycing, would trip again every 10 minutes or so. One thing we noticed was the screen would lock up and then go blank.