As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH THE APU RUNNING AND THE AVIONICS ON, COCKPIT AND THEN CABIN FILLED WITH SMOKE. SMOKE APPEARED TO BE COMING FROM THE GLARE SHIELD AREA AND FILLED THE COCKPIT FIRST. IT WAS A WHITE SMOKE WITH A PLASTIC LIKE ODOR. R & R THE APU IAW MM 49-10-00. OPS & LEAK CHECKED GOOD.