As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN GEARBOX TO OIL COOLER TRANSFER TUBE LEAKING DUE TO CORROSION PITTING. AREA WHERE TUBE RUNS THRU AREA IS FILLED WITH LOOSE FIBERGLASS SOUND PROOFING WHICH HOLDS MOISTURE AND CAUSES CORROSION. RECOMMEND REMOVING INSULATION FROM THESE AREAS.