As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HF UNABLE TO TRANSMIT, RECEIVE ONLY. NO INOPERATIVE OR FAIL INDICATION ON PANEL. TOGGLED ACTIVE TO STANDBY. AFTER APPROX 10 MINUTES TRANSMIT CAPABILITIES REGAINED ON NR 1 HF. ACFT GROUNDED. PERFORMED FIM 23-11 TASK 806, OPS NORMAL HF1 RECEIVE/TRANSMIT. GROUND VERIFICATION GOOD.