As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRUT PREVIOUSLY O/H AT ANOTHER REPAIR STATION. MULTIPLE DISCREPANCIES WERE FOUND UPON TEAR DOWN. STAGE 2 HAD AN EXTRA PISTON, THE ORIGINAL PISTON WAS LEFT IN AND THE NEW PN PISTON SUPPLIED IN THE O/H KIT WAS INSTALLED BUT MISSING THE GUIDE RING. STAGE 2 VALVE SUPPORT WAS MISSING 1 OF THE 6 DRIVING PINS THAT ARE USED TO SECURE IN PLACE 3. STAGE 2 VALVE SUPPORT INSTALLED INCORRECTLY.