As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FUNCTIONAL CHECK FLIGHT AFTER BDSF CONVERSION, AFTER TAKE-OFF: FWD CARGO FIRE, AFT CARGO FIRE WARNING ILLUMINATES FEW SECONDS AFTER FIRE WARNING TEST SWITCH WAS RELEASED (ACCORDING TO THE POST CARGO CONVERSION TEST FLIGHT PROCEDURE). CHECKLIST WAS PERFORMED (8.12) INCLUDING FIRE BOTTLES DISCHARGES, THE COCKPIT WAS LEFT "AS IS" FOR FURTHER INVESTIGATION.