HELP Bourgault Zynx X20 monitor problems

I am having trouble with my X20 monitor. I keep getting a NO COMMS and a NO INTERFACE alarm. It is on a 6550ST tank with 4 tank metering a NH3 sectional control. I have disconnected my sectional control ECU, tried my main ECU on another seeder, updated my wiring harness couplers and pins to the newer style Duetsh connector. Mechanic tells me it is the interface module. Replace it. No different. Change 9pin serial cable between monitor and interface module and no change. Hookup a new monitor and thought I had the problem solved . No alarms until I started programming the new monitor to my tank configuration and alarms start coming on again. Any ideas what could be causing it? Could it be something in the programming? Mechanic says it has to be between the monitor and the interface module to get a NO INTERFACE alarm. I have replaced all that and same problem. Mechanic has no idea what is causing it and I'm kinda stucl on my own trying to fix it now. Has any one had this type of problem?

HELP Bourgault Zynx X20 monitor problems