As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLIGHT 3854 UPON DESCENT INTO BWI WHEN GEAR WAS SELECTED DOWN THE CREW RECEIVED YELLOW CAUTION LIGHTS FOR HANDLE AND GEAR DOORS. LANDING GEAR REMAINED IN THE UP POSITION. CREW PERFORMED AN ALTERNATE GEAR EXTENSION AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT SYSTEM, FOUND THE LANDING GEAR SELECTOR VALVE LEAKING. REMOVED AND REPLACED THE LANDING GEAR SELECTOR VALVE IAW DHC PROCEDURES, OPERATIONAL CHECK WAS GOOD. AIRCRAFT WAS RETURNED TO SERVICE.