As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED INITIAL OBSERVATION WAS SMOKE IN CABIN AND COCKPIT. UPON FURTHER INVESTIGATION FOUND APU TURBINE WHEEL DAMAGED. APU THEN DEFERRED IAW MEL 49-1. MAINTENANCE REMOVED AND REPLACED THE APU IAW EMB MM. OPERATIONAL AND LEAK CHECKS WERE SATISFACTORY AND AIRCRAFT WAS RETURNED TO SERVICE. (M)