I have a TAC50-04 that is giving me a 1021 & 1687 faults. I changed the communication line to a spare shield. The elevator would run and then randomly stop and throw those faults along with a 1684 fault. Not the elevator won’t run. When trying to run on controller inspection it will fault out. On Automatic I have my INCTM & INHAM inputs active. However when I try to run it everything clicks and it tries to run but then faults out and all the Cartop inspection I/Os come on and off. Any help is appreciated.