As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"DISCHARGE" LIGHT ON CARGO FIRE PANEL CAME ON AND OFF IN FLIGHT. GROUNDED - YES. REMOVED, REPLACED CARGO FIRE CONTROL PANEL PER B737-800 AMM 26-00-02-400-801 OPS NML PER AMM 26-23-00-730-802. REMOVED & REPLACED CARGO FIRE BOTTLE #1 REF ASA T/C 78226001. OPS CHECKED GOOD