As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE BOTTLE WAS DISCHARGED DUE TO HEAVY BLACK SMOKE COMING FROM INLET, TAILPIPE, AND COWLING OF APU. APU INOP DUE TO FIRE BOTTLE PREVIOUSLY DISCHARGED. FIRE BOTTLE TRANSFERRED TO DI PG 88002 CAT C, PER MEL 26-8 M06-056. INSPECTED APU PER MM 49-11-00 PG601. TRANSFERRED TO DI PG CAT C, PER MEL 49-1 DMI M06-057.