What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF FAIL IN BOTH VHF COMMUNICATION EQUIPMENTS. THE VHF'S WAS SWAPPED, REPOSITIONED AND THE SYSTEM WAS TESTED IAW M/M 23-20-01, BEING CORRECT. DURING OVERNIGHT CHECK, BOTH VHF SYSTEM WERE TESTED IAW M/M 23-20-00, BEING ALL CORRECT.