As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 HF RADIO - INDICATES FAIL ON RADIO TUNING PANEL. GROUNDED - YES. PERFORMED HF COMMUNICATION SYSTEM BITE ON #1 AND #2 HF TRANSCEIVER. NO FAULTS. ACTIVE AND STANDBY FREQ SHOWN ON RTP. INTERMITTENT FAULT. OPS CHECK GOOD. REF B737-800 FIM 23-11 TASK 802. GROUND VERIFICATION TEST GOOD.