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.