As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF MLG LEFT AND RIGHT DOOR/GEAR INTRANSIT LIGHTS REMAINED ILLUMINATED AND NOSE GEAR INDICATED UP AND LOCKED. CREW CYCLED GEAR AND STILL HAD MAIN GEAR/DOOR INTRANSIT LIGHTS. SELECTED GEAR DOWN AND HAD THREE GREEN DOWN AND LOCKED INDICATION. RETURNED TO FIELD WITH NO EMERGENCY DECLARED, LANDED SAFELY. MAINTENANCE PERFORMED GEAR RETRACTION CHECKS IAW DHC-8 M/M 32-30, COULD NOT DUPLICATE PROBLEM AND AIRCRAFT RETURNED TO SERVICE.