As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM, BOTH VHF COM WERE OUT OF SERVICE. MICROPHONES WERE SWAPPED AND THEY WERE OPERATING IN A CORRECT WAY. DURING OVERNIGHT SERVICE THE MICROPHONE OF OBSERVERS SIDE WAS REPLACED IAW MM 23-50-00, ALL TEST CORRECT.