As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL33, AC PACK NR 1 FLOW VALVE WAS SURGING WITH PACK SELECT SWITCH IN AUTO. COCKPIT FILLED WITH SMOKE. RAN PROCEDURES FROM FOM VOLUME I, PAGE I-110 AND SECURED THE NR 1 AC PACK. SMOKE STOPPED AS SOON AS PACK WAS TURNED OFF. ENTERED IN MEL LOG AS MEL 21-1, CONTROL NR M602-4173. (M)