As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BUSHING INSERT MIGRATED TO THE OUTSIDE OF THE BUSHING ASSEMBLY CAUSING PLAY IN THE MAIN LANDING GEAR. THIS HAS HAPPENED ON TWO 172'S THAT ARE OPERATED IN A FLIGHT SCHOOL ENVIRONMENT. BOTH 172'S HAVE SIMILAR TOTAL TIME. THE BUSHINGS ARE RETAINED FOR INSPECTION AS NECESSARY.