What was found
(CAN) AFTER PUSHBACK THE COCKPIT FILLED WITH SMOKE AND ASH, LEFT PACK AUTO FAIL MSG CAME ON. THE PACK WAS SHUT OFF AND THE SMOKE CLEARED. THE A/C RETURNED TO GATE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) AFTER PUSHBACK THE COCKPIT FILLED WITH SMOKE AND ASH, LEFT PACK AUTO FAIL MSG CAME ON. THE PACK WAS SHUT OFF AND THE SMOKE CLEARED. THE A/C RETURNED TO GATE.