As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - FLT 1236 - WHILE TAXIING AT LAS, CABIN AND COCKPIT FILLED WITH SMOKE, PERFORMED EMERGENCY EVACUATION. TURNED OFF APU SMOKE STOPPED. SECURED LOOST B-NUT AT LEFT THRUST REVERSER. CLEANED ACCUMULATOR AREA. ACCOMPLISHED PACK BURN OUT. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)