As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A SERVICE BULLETIN ON A PRIMARY SERVO (SB KS271C-5 ALERT) NOTED THE SERVO GEAR TEETH TO HAVE EXCESSIVE WEAR. GEAR BEARING APPEARS TO BE MAKING METAL. MEAL POWDER RESIN VISIBLE UNDER THE GEAR. GEAR ROTATION IS NOT SMOOTH AND MAKES A SLIGHT GRINDING SOUND. ACFT TOTAL TIME: 390 HOURS. PITCH AND TRIM SERVOS OK. (X)