As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - DURING INITIAL GEAR RETRACTION AFTER TAKEOFF, LEFT GEAR UNSAFE LIGHT REMAINED ILLUMINATED. RECYCLED LANDING GEAR WITH SAME INDICATION. UPLATCH CHECK YIELDED GEAR DOOR OPEN LIGHT AND LEFT GEAR UNSAFE LIGHT. ADJUSTED LEFT MAIN LANDING GEAR DOOR ROLLER IAW DC-9 MM 32-51-4. TEST OF MAIN GEAR LATCH MECHANISM WAS GOOD AT THIS TIME.