The following cables for the demod concentrator readbacks (HAM6) did not have pin 19 connected as reported by Daniel Sigg https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=8640 : H1:ISC_203 H1:ISC_204 H1:ISC_205 H1:ISC_207 H1:ISC_210 Pin 19 was attached on both ends and reconnected back to electronics.