Looked at ISC Whitening Chassis in ISC-R5. Jenne reported one of the gain binary bits was not changing states. Went out to the floor and verified binary request was getting to the whitening chassis via the DB37 cable. We could see the states change from high to low with the cable disconnected.  When binary cable was connected to the whitening chassis, signal was pulled low. Replaced chassis S1101583 with S1101595. Will troubleshoot in EE lab.

F. Clara, J. Driggers, M. Pirello