As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SEAL ON THE HALON FIRE EXTINGUISHER IN THE COCKPIT FAILED ON PUSHBACK DISCHARGING THE EXTINGUISHING AGENT. ACFT RETURNED TO GATE AND BOTTLE WAS REPLACED. OPERATOR HAS EXPERIENCED SIMILAR INCIDENTS IN THE PAST. REF SDR 20070809003 AND SDR 20070809004 FOR ADDITIONAL DETAILS AND FINDINGS.