What was found
DURING FLIGHT (EBBR), NR 1 AND NR 2 VHF WOULD NOT RECEIVE TRANSMISSIONS OVER NORMAL DISTANCE, LOST COMMUNICATION WITH ATC. AIR TURN BACK TO EBBR DUE TO VHF TRANSCEIVER FAILURES, NO FUEL DUMP REQUIRED. R&R NR 1 VHF TRANSCEIVER IN ACCORDANCE WITH AMM 23-21-01. SWAPPED NR 2 VHF TRANSCEIVER WITH NR 3 VHF TRANSCEIVER IN ACCORDANCE WITH AMM 23-21-02, NR 2 VHF TRANSCEIVER OPS CHECKED NORMAL. NR 3 VHF TRANSCEIVER DEFERRED MX IN ACCORDANCE WITH DISPATCH DEVIATION PROCEDURES GUIDE (DDPG), MEL 23-3 (1), CATEGORY D.