As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN REMOVING THE P/C FILTER FOR A SCHEDULED 100 HR CLEANING THE THREADS ON THE FITTING WERE VERY TIGHT TO COME OFF. INSP OF THE THREADS ON THE FILTER HSG SHOWED THE THREADS WERE STRIPPED. LOG BOOK SHOWED THE P/C FILTER ASSY WAS INSTALLED NEW JUST 68 HR FOR THE SAME PROBLEM. PURCHASING A DIFFERENT PN/MFG FILTER HAS BEEN DONE TO HOPEFULLY TO FIX THIS PROBLEM.