As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED KLBF FOR KDEN. PILOT REPORTED LT MLG FAILED TO INDICATE UP AFTER TAKEOFF. PILOT CYCLED GEAR SEVERAL TIMES, LT MAIN NEVER RETRACTED, SHOWED IN TRANSIT THROUGH REST OF FLIGHT. EMERGENCY GEAR EXTENSION WAS ATTEMPTED, NOSE AND RH GEAR LOCKED DOWN, LH INDICATED IN TRANSIT. AIRCRAFT LANDED RWY 35L AT KDEN. LH MAIN GEAR COLLASPED.