What was found
HF1 REC ONLY...CANNOT X-MIT ON HF1 REPEAT WRITE UP INSTALLED NEW COUPLER IN #1 HF POSTION FOR TROUBLESHOOTING. UNIT IS NOT SAFETY WIRED AND WILL NEED OPS CHECK AT COMPLETION OF WORK. INSTALLED NEW HF TRANSCIEVER IN #1 POSITION. WILL NEED OPS CHECK AT COMPLETION OF WORK. PERFORMED RESISTANCE CHK ON HF1 COAX CABLE FROM CONNECTOR D337 (M227) TO D8517P (M226). CLEANED AND SECURED CONNECTOR D8517P AT SHELF E8-1. OPS CHK NORMAL PER WDM 23-11-11. ACCOMPLISHED A VOICE COMMUNICATION CHK WITH SFO ARINC WITH A 4X4 RESULT TRANSMITT AND RECEIVE PER FIM 23-11-00. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1020371 SN OFF 0826 IPC REFERENCE # 23-11-61 COUPLER, HF ANT OFF 29-2311-9-0012 0826 ON 29-2311-9-0012 5468