As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH INTO KPLN, THE FLIGHT CREW HAD TO MANUALLY EXTEND THE LANDING GEAR. LAN MAINTENANCE INSPECTED THE LANDING GEAR RELAY AND WEIGHT ON WHEELS SWITCH/ WIRING AND COULD NOT DUPLICATE THE FAILURE. MAINTENANCE SERVICED THE MANUAL EXTENSION RESERVOIR AND RETURNED THE AIRCRAFT TO SERVICE AFTER MULTIPLE SUCCESSFUL GEAR EXTENSION AND RETRACTION OPERATIONAL CHECKS.