The OM1 and OM2 coil drivers were found to have bad Vmon channels. Chassis S1200614 was found to have -14VDC present on the output of IC5 (OP27) on Ch2. Similarly, S1200612 exhibited the same symptoms on Chs 2&3 (-13V and +14V respectively). In all cases, IC5 was replaced and this DC issue was reolved and the chassis were placed back into service. IC5 is the Vmon-N circuit. All Vmon circuits were examined (P & N).  If there are any further issues with this circuit please let me or Filiberto know. Original post: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=13585