As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A 500 HOUR INSPECTION, THE M/R HEAD WAS DISSASSEMBLED. THE FREQUENCY ADAPTERS WERE REMOVED FOR INSPECTION. ATTEMPTS TO REMOVE THE BEARING BY PUSHING OR TAPPING LIGHTLY FAILED. THE DECISION WAS MADE TO CHANGE THE ADAPTER AND BEARING. THE BEARING WAS FINALLY REMOVED BY CUTTING THE FREQUENCY ADAPTER IN HALF. UPON REMOVAL OF THE BEARING, CORROSION WAS FOUND ON ALL OF THE MATING SURFACES. ALL THREE ADAPTERS WERE IN THE SAME CONDITION.