As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON GEAR EXTENSION, THE CREW RECEIVED 3 RED LIGHTS. CREW PERFORMED AN ALTERNATE GEAR EXTENSION AND LANDED UNEVENTFULLY. DURING MAINTENANCE ASSESSMENT, THE LANDING GEAR SELECTOR VALVE FOUND TO BE AT FAULT AND WAS REPLACED IAW THE APPLICABLE AMM. ADDITIONALLY, A SUCCESSFUL RETRACTION/EXTENSION CHECK TOOK PLACE.