As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APPROX 0300Z, NR 2 HF DISPLAYED NO COMM ON CDU AT 0500Z NR 2 HF AND NO RESPONSE. NR 2 HF INOPERATIVE TRANSMIT AND RECEIVE BOTH VOICE AND DATA. ACFT GROUNDED. PERFORMED HF COMMUNICATION SYS - OPS TEST OM BOTH NR 1 & NR 2 HF SYS, IAW AMM 23-11-00-710-801. ALL TESTS PASSED. ALSO, THERE IS NO MX HISTORY FOUND WITHIN THE PAST 30 DAYS.