As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING OPERATION 8 INSPECTION WHEN REMOVING ANTI-ICE FILTER CAP, FOUND CAP FROZEN OR GALLED AND ON OTHER ANTI-ICE VALVE, THE CAP FROZE OR GALLED UPON RE-INSTALLING CAP AFTER CLEANING AND INSPECTING FILTER. RECOMMEND PROPER COMPOUND BE APPLIED BY OVERHAUL AND MANUFACTURING FACILITIES TO PREVENT THREAD SEIZURE.