As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS "FAIL" INDICATED IN BOTH FREQ WINDOWS OF BOTH CAPT'S & F/O'S RTP'S WHEN HF2 SELECTED ON EITHER PANEL. GROUNDED - YES. RESET POWER TO HF2 SYST BY PULLING, THEN RESETTING HF2 C/B. "FAIL" EXTINGUISHED IN ALL RTP WINDOWS AND SET FREQUENCIES RETURNED. HF2 OPS NRML REF B737-800 AMM 23-11-00 - XMIT & RECEIVE CONTACT ESTABLISHED W/ SAN FRANCISCO ARINC. GND VERIFICATION SUCCESSFUL.