As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTFL WITH SMOKE IN THE CABIN. [07-06-07] FOUND MAT MSG 49-11150 "APU CONTROLLER FAILED". CONTINUED TROUBLE SHOOTING & DETERMINED SOURCE OF SMOKE WAS APU. REPLACED GTCP331-500B APU. ACCOMPLISHED APU VERIFICATION FLIGHT. AIRCRAFT OK FOR SERVICE. SUSPECT INTERNAL APU FAILURE ALLOWED SMOKE TO ENTER BLEED AIR SYSTEM.