As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA - MX WAS IN THE COCKPIT OF THE A/C TROUBLESHOOTING THE APU, AND RECEIVED AN APU FIRE MESSAGE AND DISCHARGED THE FIRE BOTTLE. THE APU FIRE BOTTLE WAS REMOVED AND REPLACED IAW EMB 145 AMM 26-22-01 AND OPS CHECKED GOOD. THE APU WAS REMOVED AND REPLACED IAW T/C 6849001 AND THE OPS AND LEAK CHECK WERE GOOD. A/C HAS BEEN RELEASED TO SERVICE.