As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: FIRE EXTINGUISHER DISCHARGED IN THE FLIGHT DECK. ONLY CLEAR GAS EXPELLED; AIRCRAFT DIVERTED TO AND LANDED SAFELY AT BNA. REMOVED AND REPLACED FLIGHT DECK FIRE EXTINGUISHER. PER AMM 26-26-01.