As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL INFLIGHT T4XG/07OCT - TAIL COMPARTMENT TEMPERATURE LIGHT ILLUMINATED. SHUT OFF LEFT AIR CONDITIONING PACK AND LIGHT WENT OUT AFTER TWO MINUTES. RETURNED TO STL AND LANDED WITHOUT INCIDENT. REPLACED TURBINE INLET TEMPERATURE SWITCH AND COMPRESSOR DISCHARGE SWITCH AND LEFT AIR CYCLE MACHINE. SYSTEM GROUND CHECKED NORMAL OPERATION.