Retested Cable ISC-BSC6-1. Issue still exists on pins 19 and 18. All other sets on this cable show a forward voltage drop around 0.429V for the diodes. Below is a list of the pins I tested that passed.
Pin 19 and 17
Pin 19 and 5
Pin 19 and 4
Pin 16 and 15
Pin 16 and 14
Pin 16 and 2
Pin 16 and 1