Hello looking for some insight on this one. Have a tac 50 16 bit that lost the 186C cpu board. I was actually able to find a board and got all of the software and job config files installed. Car is now running but has a 1528 fault which is a CAN Channel 3 fault. The car can’t see any of the HN boards. When I try TECF command teach in fails at the first HN. This is car 1 (master) of a 2 car group. So, when powered up neither car will answer hall calls. When I kill power to car 1, car 2 then sees all HN boards and begins answering hall calls. Not sure if this is a software issue or still a problem in the cpu. Thanks in advance for any help!