What was found
AFTER APU START WITH BLEED SELECTED OFF, ACFT FILLED WITH SMOKE. RAN APU WITH AND WITHOUT BLEED SELECTED, NO SMOKE NOTED. APU OIL LEVEL CHECKED GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER APU START WITH BLEED SELECTED OFF, ACFT FILLED WITH SMOKE. RAN APU WITH AND WITHOUT BLEED SELECTED, NO SMOKE NOTED. APU OIL LEVEL CHECKED GOOD.