As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LEFT MAIN GEAR WOULD NOT RETRACT. CYCLED TWICE AND FIRST TRY SHOWED ONLY RED LIGHTS FOR LEFT. SECOND SHOWED RED AND GREEN LIGHTS FOR LEFT GEAR. FOUND LEFT FORWARD INBOARD GEAR DOOR OPEN. CLOSED DOOR AND ADJUSTED SPRING FOR DOOR LATCHES. PERFORMED LANDING GEAR RETRACTION CHECKS AND CYCLED GEAR SEVERAL TIMES. OPS CHECKS GOOD.