As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUTDOWN. PERFORMED A RESTART AND IT SHUTDOWN AGAIN. APU BLEW FLAMES AND SMOKE. CHECKED APU FOR FIRE XTINGUISHING BOTTLE DISCHARGE FOUND NO DISCHARGE & APU BOTTLE ALSO GOOD. REMOVED AND REPLACED THE APU IAW 200-49-10-00. OPS CHECKED GOOD, NO LEAKS. INSTALLED THE GENERATOR IAW AMM 24-22-01.