As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE CAPTAIN COULD NOT TRANSMIT ON COMM 1A OR 1B OR 2A OR 2B. THE FIRST OFFICER COULD NOT TRANSMIT ON COMM 1A OR 1B OR 2B. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. TROUBLESHOT TO THE CAPTAIN'S HANDHELD MICROPHONE, WHICH WAS CAUSING A HOT MIC CONDITION. REPLACED HANDHELD MICROPHONE, OPERATIONAL CHECKS GOOD.