As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARGO FIRE WARNING INDICATED FORWARD BELLY FIRE. SHORTLY AFTER, FIRE LIGHT WENT OUT, FORWARD SMOKE INOPERATIVE LIGHT CAME ON. THEN REPEATED FIRE WARNING AGAIN. COMPLETED EMERGENCY PROCEDURE. REPLACED THE CENTRAL CONTROL UNIT. OPS CHECKED GOOD IAW DC-9 AMM 26-15-00-5.