As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5158 UPON APPROACH THE PILOTS REPORTED THAT THE RIGHT MAIN LANDING GEAR WOULD NOT EXTEND. PILOTS PERFORMED A MANUAL EXTENSION. MAINTENANCE CLEANED THE RIGHT HAND DOWNLOCK SWITCH AND PERFORMED SIX LANDING GEAR EXTESNIONS AND RETRACTIONS IAW MM 32-30-00. ALL CHECKS WERE GOOD AND THE FAULT COULD NOT BE DUPLICATED.