As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 VHF NO TRANSMIT OR RECEIVE ON BOTH HEADS OF RADIO. NR 1 AND NR 3 VHF SETS INTERCHANGED NO GOOD. VHF CONTROL HEADS INTERCHANGED NO GOOD, AUDIO SELECTORS INTERCHANGED AND CAPTAINS AND F/O'S MIC`S INTERCHANGED ALL OPS RETURNED TO NORMAL. SUSPECT NR 1 MIC KEY LINE STUCK ON & RELEASED BY INTERCHANGE. CREW REPORT BOTH VHFS NOW OK.