As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING RT ENGINE AND PUTTING ON PACKS, COCKPIT FILLED WITH SMOKE. RAN LT AND RT PACKS OFF APU AIR. NO SMOKE OR ODOR. STARTED ENG OFF APU AIR CROSSBLEED STARTED LT ENG. RAN PACKS FULL H TO FULL COLD 3 TIMES. NO SMOKE OR ODOR. RAN ENG TO TAKEOFF PWR FOR 3 MIN. NO SMOKE OR ODOR. OK FOR SVC.