As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CARGO FIRE EXTINGUISHER BOTTLE AUTO DEPLOYED, NOT ENTIRELY SURE OF CAUSE- SUSPECT ACFT BATTERY WAS LT ON THUS POWER DRAINED DOWN TO AN ALMOST DEAD CAPACITY AND FIRE EXTINGUISHER CONTROL BOX SENSED THIS AND AUTO DEPLOYED THE FIRE EXTINGUISHER INTO ACFT CARGO PIT. CONTROLLER BOX. REPLACED FOR A PRECAUTIONARY MEASURE.