As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN LANDING GEAR WAS RETRACTED, THE 'DOORS' LIGHT REMAINED ILLUMINATED. RETURNED TO DFW. FOUND LEFT NOSE GEAR DOOR DOWN AND NOT LATCHED. INSPECTED DOOR AND LINKAGE. FOUND DOOR RELEASE STICKING. LUBRICATED LATCH AND RESECURED DOOR, OPS CHECKED GOOD.