As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LWR AFT CARGO FIRE LIGHT CAME ON AFTER TAKEOFF AND THEN EXTINGUISHED ON FINAL APPROACH BACK. ADDITIONALLY THE DUCT OVERHEAT LIGHT ON PILOTS OVERHEAD PANEL CAME ON AND REMAINED ON DURING FINAL APPROACH. TEMP PEGGED AT 250 DEGREES OR GREATER. OPS CHECK OF LOWER CARGO SMOKE DETECTION SYS NORMAL IAW MM. VISUALLY INSPECTED BLEED AIR DUCTS AND OVERHEAT SENSORS. PERFORMED HIGH POWER RUN NO LEAKS DETECTED. OVERHEAT SYSTEM TEST NORMAL IAW MM.