As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MALFUNCTION: PACKING, PN 561-515-0003, IS SEPARATING FROM THE GUIDE ASSEMBLY CAUSING THE OVERPRESSURE SWITCHER TO FAIL. THE PACKING IS INSTALLED USING ADHESIVE ECCOBOND 104. PROBABLE CAUSE: THE ADHESIVE APPEARS TO BREAKDOWN UNDER HEAT AND/OR HAS A REACTION WITH THE LUBRICANT, BRAYCOTE 601, CAUSING THE PACKING TO SEPARATE. UNIT TSR 773:22 HOURS BEFORE FAILURE.