As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING TAXING TO THE GATE THE AFT CARGO FIRE RED LIGHT CAME ON, OPERATED FIRE BOTTLE DISCHARGED BUTTON IAW THE QRH. REPLACED LT NR 1 CARGO FIRE BOTTLE IAW AMM 26-23-01 IAW 4734755 & AFT CARGO ELECTRONIC UNIT IAW AMM 26-16-02-000-80. TAXI AIRCRAFT RAN PACKS WITH ENGS & APU. CARGO FIRE DETECTION & SQUIBS TESTED NORMAL