As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL INJECTOR DURING O/H. IAW THE MFG CHECKLIST MAG CHECK IS AT 2200 RPM. MIXTURE IS LEANED TO PEAK, RPM THEN RETARDED TO 2200 RPM. WHEN LEANED, NORMAL RISE IS 40-50 RPM. THIS WAS IN EXCESS OF 200 RPM. THE REPAIR STATION REPORTED RICHNESS. AT 513TT INJECTOR WAS REMOVED FOR REPAIR. THE REPAIR STATION REPORTED DEFORMITY OF THE SERVO STEM SEAL.