As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED HF NO2 WAS INOP. OPERATIONS WERE CONTINUED ON MEL. THE MAINTENANCE TEAM REMOVED THE DEFECTIVE HF TRANSCEIVER AND REPLACED IT WITH AN OVERHAULED UNIT. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE