As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, CREW COULD NOT TRANSMIT OR RECEIVE ON RADIO NR 1 & NR 2. FIRST OFFICER THINKS HIS YOKE SWITCH IS STUCK. FLIGHT DIVERTED TO MCO BECAUSE OF THE DIFFICULTY THE STUCK MIC WAS CAUSING. FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE FIRST OFFICERS CONTROL WHEEL PTT SWITCH PER AMM 23-51-41-404-02. BOTH RADIO NR 1 AND NR 2 OPS CHECK GOOD WITH PTT SWITCH.