As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUTDOWN ON GND AND CAUSED SMOKE IN CABIN *****AIRCRAFT REMOVED FROM SERVICE********** PREFORMED PAC BURN OUT PROCEDURE IAW AWAC SUP 09-037E, NO UNUSUAL SMELLS OR SMOKE IN CABIN AFTER PROCEDURE. REF 338553-4 FOR MEL OF APU. AIRCRAFT OK FOR RTS. REF WO 335707, APU R&R FOR CORRECTIVE ACTION. REMOVED PLACARD AND FROM MEL.