As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED; ON CLIMB OUT, VERY LOUD BANGING NOISE WHEN LANDING GEAR RETRACTED. CORR ACTION; MX PERFOMRED DETAIL INSPECTION OF LANDING GEAR AND LANDING GEAR SYSTEMS. LUBRICATED ALL GEAR. PERFORMED OPERATIONAL GEAR SWINGS ON AIRCRAFT. OP CHECK GOOD.