As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 2 WORKED NORMALLY FOR FIRST 3 HRS, IT THEN QUIT TRANSMITTING BUT WILL RECEIVE. PERFORMED HF COMM NR 2 SYSTEM OPERATIONAL TEST LRU BITE W GREEN NO FAULTS. PERFORMED NR 1 & 2 HF COMM SYSTEM TEST REF 23 11 00 VOICE COMMUNICATION WITH SAN FRAN GOOD XMIT AND RECEIVE. PRECAUTIONARY REPLACED NR 2 HF TRANSCEIVER REF 22 11 21.