As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDIS: DURING PREFLIGHT FLASHING DISCHARGE SWITCH ON OVERHEAD CARGO FIRE PANEL AND DISCHARGE FIRE AGENT MESSAGE EAD. CONTACTED FIRE DEPARTMENT AND THEY RESPONDED. NO FIRE NOTED. REMOVED AND REPLACED NR 1 FIRE EXTINGUISHER CONTAINER (135LB) IAW MM 26-22-01-4, FIRE SYSTEM TEST GOOD.