As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 VHF NO TRANSMITT. NEW ANTENNA ON HAND. BOTH NEW AND OLD ANTENNA CHECK GOOD. STILL NO HELP. WE ARE NOW CHECKING THE COAX & WILL CONTINUE THE TROUBLESHOOTING. REPLACED RT TRANSCEIVER, NO HELP. INSTALLED OLD UNIT. ANTENNA REMOVED. FOUND CONNECTOR D06251P LOOSE AND DIRTY, CLEANED AND SECURED CONNECTOR WDM. ACP VHF SYS TEST IAW MM. TEST PASSED NR2 VHF TRANSMIT & RECEIVE NORMAL. REINSTALLED ANTENNA.