As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 915 - CLT-JAX - AFTER TAKEOFF, MID CARGO DOOR WARNING LIGHT ILLUMINATED. FLIGHT RETURNED TO CLT WITH NO FURTHER INCIDENT. MAINTENANCE FOUND DOOR UPPER HANDLE UNLATCHED. CYCLED DOOR OPEN AND CLOSED. LIGHT CHECKED GOOD. DOOR LATCHED PROPERLY. (M)