As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN-ROUTE FROM PHL TO BDA. CREW REPORTED THEY WERE UNABLE TO ESTABLISH COMMUNICATIONS ON EITHER HF1 OR HF2. FLIGHT RETURNED TO FIELD AT PHL & LANDED WITHOUT INCIDENT. R & R HF COUPLER, 4RE1, USING AMM 23-11-36-001-A & 23-11-36-400-001-A. PERFORMED SUCCESSFUL OPERATION CHECK OF HF SYS USING AMM TASK 23-11-00-710-001-A.