As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EXPERIENCING POPPING OF THE MAIN LANDING GEAR CB ON RETRACTION AND WAS MAKING NOISE. AIRCRAFT WAS FLOWN, GEAR DOWN AS A PRECAUTION. REMOVAL AND INSPECTION OF THE GEAR ACTUATOR REVEALED AN EXCESSIVELY WORN WORM GEAR IN THE JACKSCREW ASSEMBLY THAT WAS BINDING WITH THE PINION GEAR CAUSING JAMMING.