As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH HIGH FREQUENCY RADIOS INOPERATIVE. EMER DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED LT & RT ANTENNA COUPLERS & HIGH FREQUENCY TRANSCEIVERS MPN 8220990004. SYS GND CHECKED NORMAL OPERATION CLOSED.