As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT EXTEND, PILOT USED QRH TO MANUALLY EXTEND LANDING GEAR AND GET THREE GREEN INDICATORS THAT GEAR WAS EXTENDED BEFORE LANDING. MAINTENANCE PERSONAL INSPECTED LANDING GEAR AND FOUND DIRTY CONTACTS AT THE MAIN LANDING GEAR POWER PACK RELAY. CLEANED CONTACTS AND PERFORMED MULTIPLE LANDING FUNCTION CHECKS WITH NO FURTHER DEFECTS NOTED.