As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN FILLED WITH SMOKE WHEN LT ENGINE WAS STARTED (APU WAS ON- ON THE GROUND. [SUP 05-16-07] REMOVED & REPLACED APU IAW 560XL M.M. CHAPTER 49-10-00. OPERATION AND LEAK CHECKS GOOD. REMOVED UNIT HRS. 140.3 CYL. 304. INSTALLED UNIT HOURS 2424.3 CYCLES 3905.