As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE BELL, LIGHT AND NR 4 MAIN SMOKE SENSOR SHORTLY AFTER TAKEOFF. NO ODORS OR FUMES DETECTED. SHORTLY AFTERWARD BOTH DUCT OVERHEAT LIGHTS CAME ON. S/O HAD AIR MIX VALVE AT 12 O'CLOCK, NR 1 PACK ONLY, 100 DEG F OUTPUT INDICATED. FIRE INDICATION WENT OUT WITHIN 1 MIN.