As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, NR 2 VHF RADIO WILL NOT TRANSMIT FROM ANY POSITION. THE CREW RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. MX REPLACED FIRST OBSERVERS AUDIO SELECT PANEL AND VHF/FM COMM TRANSCEIVER. OPS CHECK GOOD IAW MM 23-20-1, AND 23-50-1. ACFT WAS RETURNED TO SERVICE.