As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT INSPECTION FOR FLIGHT 3650 THE FLIGHT ATTENDANT DISCOVERED THE LAVATORY FIRE EXTINGUISHER BOTTLE INDICATOR IN THE RED ARC. THE FIRE EXTINGUISHER BOTTLE APPEARED TO HAVE BEEN DISCHARGED. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE FIRE EXTINGUISHER BOTTLE IAW AMM 26-29-01. THE AIRCRAFT WAS RETURNED TO SERVICE.