As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, CARGO COMPARTMENT OVERHEAT LIGHT CAME ON AT FL230. SHUT OFF AIR CONDITIONING SYSTEM PER QUICK REFERENCE HANDBOOK, AIRCRAFT LANDED WITHOUT INCIDENT. FOUND UNDER FLOOR HEAT SHUTOFF VALVE HAD BLOWN GASKET. REPLACED GASKET, SYSTEM OPS CHECKED GOOD PER MM CH 21.