As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFRER TAKEOFF AFTER SELECTING GEAR UP. OBSERVED LOUD BANGING NOISE. RIGHT M.L.G. SHOWED GEAR UP AND IN TRANSIT INTERMITENTLY. AFTER 4200 FEET INDICATIONS AND OPERATIONS WERE NORMAL. MX PERFORMED EXTENSION AND RETACTION SYSTEM OPS CHECK IAW AMM 32-30-00 NO FAULTS FOUND. PERFORMED PROXIMITY SWITCHES FUNCTIONAL CHECK WITH BREAK OUT BOX. FOUND RH UP LOCK PROX SWITCH BAD. REMOVED AND REPLACED UPLOCK SWITCHES OPS CHECK GOOD. IAW AMM 32-63-05.