As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF TSR 711704, HF1 AND HF2 VOICE COMMUNICATION TEST FAILS. GROUNDED - YES. PERFORMED SYSTEM TEST OF BOTH #1 & #2 HF'S PER B737-800 AMM 23-11-00 PG# 501, BOTH SYSTEMS OPS CHECKED GOOD WHEN CALLING SFO AND LOCAL SEA FREQUENCIES FROM AIRCRAFT TO AIRCRAFT.