What was found
HF TRANSMISSION AND RECEPTION ARE INOP, WEAK, GARBLED INTERMITTENT, ETC. AT ALL CREW STNS.(1 = L HF, 2 = R HF). HF1 WILL NOT TRANSMIT IN FLIGHT, TESTED OK ON THE GROUND. RECEPTION IS NORMAL PROG TEXT: ACCOMPLISH CHRONIC REVIEW, HAS HISTORY. TUNE CYCLE TAKES FROM 15-25 SECS 130138 SHOULD TAKE 4-7 SECS. SUSPECT COUPLER AT FAULT. PCN 530-9045. REMOVED AND REPLACED LEFT HF COUPLER. HF SYSTEM REQUIRES OPS CHECK IAW MM. ACCOMPLISHED CHECK PER MM, CHECKS GOOD.