As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRZ FLT FL350. WHEN ESTABLISING CONTACT WITH ARINC/SFO RADIO NOTICED THE #2 HF FAIL LIGHT ON BOTH ACTIVE/STANDBY RADIO TUNING PNL FREQ IND WINDOWS. GROUNDED - YES. REF ASA TSR714409, VERIFIED FAIL DISCREPANCIES ON CONTROL PANEL WINDOWS, HF #2 BITE TEST FAILED "LRU STATUS SHOWS RED LED LIGHT" B737-800 FIM 23-11 TASK 801, REMOVED & REPLACED HF #2 TRANSCEIVER AND PERFORMED INSTALLATION TEST GOOD B737-800 AMM 23-11-21/401.