As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK. FLIGHT CREW REPORTED LT. MAIN LANDING GEAR UNSAFE LIGHT WOULD NOT EXTINGUISH WITH GEAR HANDLE IN "UP" POSITION. RED UNSAFE AND GREEN GEAR LIGHT ILLUMINATED WITH GEAR HANDLE IN "OFF" POSITION. AIRCRAFT RETURNED TO DEN AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND STRUT COLLAPSED CAUSING GEAR TO CATCH IN WHEEL CUT OUT AREA WHEN RETRACTED. REPLACED LT. MAIN LANDING GEAR, PERFORMED GEAR SWING AND CHECKED OKAY.