As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT HF#2 RADIO SHOWS FAIL IN BOTH ACTIVE & STANDBY WINDOWS. GROUNDED - YES. HF TRANSCEIVER SHOWS LRU FAIL, CYCLED C/B SYS RESTORED AND BITE CK GOOD PER B737-900 FMM 22-11 #801 & COMM CK SUCCESSFUL. GND VERIFICATION SUCCESSFUL.