Hoping someone can help me with this interesting issue. We have an 8 car group with 3 hall risers only had the job for about 6 months. At some point during our cat 5 testing we noticed that one of the hall risers stopped working. Started getting 1402-1406 faults but not 1401 & 1407 which are terminal landings. We lost shaft comm. checked the riser node boards and checked all connections, nothing conclusive. Had a REAL hard time trying to do a shaft setup but got it done and LON down load to boot. Shaft comm. is back, still no riser but the car tied to the riser responds to the other risers in the group but can't set hall calls from the CPU for that car! Menu 4-1 shows 0, normal operation. All cars have CAN modules and working correctly according to the led's on the top of them. The gateway looks to be normal compared to the other cars. This group does have a blue box group controller but it was turned off when we got the job so don't know if that is causing a problem. We are sending it in for repair just in case as it was in fault when we did turn it on. Would hyper term help look at something deeper on this specific car the node boards are tied to? Any and all ideas are welcome.