As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL RADIOS WENT STATIC THEN LOUD HUM COULD NOT TRANS OR RECEIVE. DURING T/S NOTED THAT ACP NR 3 VHF 1 MIC SELECTOR SWITCH CHANGE SUDDENLY WITHOUT TOUCHING IT, ACP SWAP WITH FO SIDE, & FAULT CONFIRMED DURING COMMS TEST WITH TOWER & OPS OFFICE. FOUND NR 3 ACP 1VHF SWITCH INTERMITTENT. REPLACED NR 3 ACP IAW AMM 23-51-02-400-801. OPS CHECKED OK.