As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4015 - BAG EXT LIGHT ILLUMINATED DURING CLIMB-OUT, AIRCRAFT LANDED SAFELY WITH NO FURTHER INCIDENTS. PERFORMED OPERATIONAL CHECK OF FIRE DETECTIONS SYSTEM IAW EMB 145 AMM 26-10-00. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. (M) SIMA