I looked at 2 other Tac 20s. On these the MUTS relay was mounted above the main cpu board on a terminal strip with coil wires marked underneath and with a Separate fork connectors where I see the suppressor plugged into . On the Tac 20 with this problem the MUTS relay is on the main cpu board. Im not sure where the coil gets energized. I do not have print specific for this controller layout. I do see MUTS on con 23….it’s a 5 pin connector. MUTS is labeled for #5 slot. It has 2 control wires on that terminal. I didn’t trace them yet .. I’m still working on getting the suppressor.. may have one soon and I will share my info on it