As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA-FLIGHT#3695. CREW REPORTED GEAR WOULD NOT RETRACT. GEAR RECYCLED, THEN GEAR RETRACTED. MAINTENANCE REPLACED GEAR SELECTOR VALVE IN ACCORDANCE WITH DEHAVILLAND DASH 8 MAINTENANCE MANUAL. AFTER PERFORMING SEVERAL GEAR RETRACTIONS AND EXTENSIONS OPERATIONAL CHECK AND LEAK CHECK WAS GOOD. AIRCRAFT RETURNED TO SERVICE.