As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CARGO DOOR SYSTEM-A LIGHT ILLUMINATED AT FL240. ACCOMPLISHED MAIN CARGO DOOR LIGHT ILLUMINATED IN FLIGHT EMERGENCY PROCEDURE. PRESSURIZATION NORMAL. CONTINUED FLIGHT. INSPECTED MAIN CARGO DOOR VENT SYSTEM. PERFORMED OPS CHECK OF DOOR SYSTEM AND FOUND NO DEFECT. OK FOR SERVICE PER DC-8 MMS 52-70-00.