As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF RADIO NR 1 FAILED ENROUTE. UNABLE TO TRANSMIT OR RECEIVE, HF SENSITIVITY SET TO 100. ACFT GROUNDED. CONFIRMED NR 1 HF HAS NO TX, NO SIDETONE AND NO TONE. REPLACED NR 1 COUPLER IAW TASK 23-11-61-000-801 AND 23-11-61-400-801. OPS CHECKED GOOD. AFTER ABOUT 5 MIN, WHILE TESTING VARIOUS FREQ'S, NR 1 HF C/B POPPED. COULD NOT RESET. REPLACED NR 1 HF TRANSEIVER. BITE TEST GOOD PER TASK 23-11 TASK 801. RAN RADIO FOR HALF HOUR. C/B REMAINED CLOSED. RADIO CHECKS GOOD. NO FAULTS NOTED.