As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 HF RADIO FAILED ENROUTE. GROUNDED - YES. PERFORMED HF2 BITE WITH NO FAULTS FOUND CW B737-800 FIM 23-11 TASK 806 AND WAS UNABLE TO ESTABLISH 2 WAY COMMUNICATION. PLACED HF2 ON MEL 23-11A. REMOVED AND REPLACED HF#2 COUPLER IAW B737 800 AMM 23 11 61. ACCOMPLISHED HF SYSTEM TEST AMM TASK 23-11-00-730-801. OPS CK GOOD. THIS CLEARS MEL 23-11A.