What was found
HF 1 RADIO TRANSMISSION PROBLEM AT ALL STATIONS UNABLE TO XMIT RCVD LONG TUNING TONE THEN NOTHING CAN RCV VOICE/ SELCAL TOMC APPROVES BOTH HF''S ON MEL 2311E DISPATCH DESK: 59 DATE: 05-MAR-19- OC DESK: 737 DATE: 05-MAR-19- DEFERRED DIRECTLY BY TOMC REMOVED & REPLACED LT SD COUPLER & AMP; LT SD TRANSCEIVER AS PER AMM SEC 23-11-61-401 & 23-11-21-401. GRND OPS CHKD LT SD HF SYS WITH SFO 3X3 @ FREQ 3494 & 5574. SELCAL CHKD GOOD. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1202046 SN OFF 2610 TT # 1164015 SN OFF 8881 COUPLER, HF ANT OFF 29-2311-9-0012 2610 ON 29-2311-9-0012 0244 TRANSCEIVER, HF OFF 29-2311-9-0010 8881 ON 29-2311-9-0010 1752 R&R NR 2 COUPLER AND NR 2 TRANSCEIVER PERFORMED HF RADIO CHK ON SAN FRAN 3494 AND 5574 AND SELCAL CHK OK. REF AMM 23-11-21-401 AND AMM 23-11-61-401. PLACARD REMOVED. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1059822 SN OFF 2596 TT # 1023965 SN OFF 2855 IPC