As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLT 598 - ON CLIMB-OUT OF CLE, CAPTAIN RECEIVED A MID CABIN DOOR WARNING LIGHT. FLIGHT RETURNED TO CLE WHERE LANDING WAS WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND MID CARGO HANDLE OPEN. CLOSED HANDLE. WARNING LIGHTS OPS NORMAL. (M)