As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO ARINC REPORTS HF NR 1 TRANSMITS NORMALLY BUT ONLY RECEIVES GARBLED NOISE (1 X 1). HF NR 2 TRANSMIT & RECEIVE NORMAL. SNAG NR 23107048. CONFIRMED NR 1 HF TRANSCEIVER INOP. INSTALLED SERVICEABLE HF TRANSCEIVER IN NR 1 POSITION. PART NUMBER VERIFIED WITH SEAMC. INSTALLATION PER MM 23 11 21 AND OPS TEST PER MM 23 11 00 NR 1 HF, OPS NORMAL.