As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5400 DURING CRUISE FLIGHT AT FLIGHT LEVEL 270 RECEIVED A CARGO BOTTLE LOW PRESSURE MESSAGE, EXTINGUISHED AT FLIGHT LEVEL 180. CREW DECLARED AN EMERGENCY, DIVERTED TO JAX AND LANDED SAFELY. PERFORMED INSPECTION OF CARGO BAY, NO EVIDENCE OF FIRE. DEFERRED THE CARGO COMPARTMENT FIRE EXTINGUISHING SYSTEM PER MEL 26-25-01.