As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE FORWARD CARGO FIRE WARNING LIGHT CAME ON. PILOT FIRED FIRE EXTINGUISHER BOTTLE AND RETURNED TO AIRPORT. INSPECTED FORWARD CARGO COMPARTMENT, THERE WERE NO SIGNS OF A FIRE. DUST FROM A LIVE SHIPMENT OF BIRDS WAS THE LIKELY CAUSE OF THE FIRE WARNING. REPLACED THE FIRE EXTINGUISHER BOTTLE. PERFORMED SYSTEMS TESTS. NO PROBLEMS WERE NOTED.