As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START IN AIR OR ON THE GND DOOR W/N OPEN SMOKE COMING FROM INLET DOOR. INSPECTED APU COMPARTMENT, NO SIGNS OF FIRE, NO DUCT LEAKS NOTICEABLE , NO EVIDENCE OF FLUID LEAKS. CHECKED APU OIL LEVEL, CHECKED GOOD. CLOSED APU ENCLOSURE.