As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LANDING GEAR WAS SELECTED DOWN ON APPROACH AND ONLY 3 RED LIGHTS WERE INDICATED. PERFORMED ALTERNATE GEAR EXTENSION AND LANDED NORMALLY. MAINTENANCE TROUBLESHOOTING DISCOVERED PSEU FAULT CODE DIN01A. LANDING GEAR SELECTOR CONTROL UNIT WAS REPLACED AND GEAR SWINGS WERE COMPLETED WITH NO FURTHER FAULTS. THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE.