What was found
DURING A REPOSITION FROM SIGNATURE TERMINAL ONE TO SIGNATURE TERMINAL TWO IN DAL, A STRONG OZONE LIKE ODOR WAS ENTERING THE CABIN. BOTH OF US IN THE COCKPIT IMMEDIATELY NOTICED SMOKE/HAZE. FLIGHT ATTENDANT RUSHED FORWARD, AND SAID THE CABIN IS FILLING WITH SMOKE. UNAWARE OF WHAT WAS GENERATING THE SMOKE WE IMMEDIATELY TURNED OFF THE CABIN. ALMOST SIMULTANEOUSLY THE L PACK FAIL AMBER CAS MESSAGE APPEARED. AT THIS TIME WE WERE PULLING ONTO THE RAMP, AND WE IMMEDIATELY TAXIED IN AND SHUT DOWN AND EVACUATED THE PLANE FOR FRESH AIR. WE RE-ENTERED THE PLANE AND RAN THE LEFT PACK FAIL, AMBER CHECKLIST. THE LEFT PACK FAILED AGAIN. ON THE ARRIVAL INTO DALLAS, LOVE, BOTH MYSELF, AND MY COPILOT THOUGHT WE GOT A SMALL SCENT OF SMOKE OR A STRANGE SMELL, BUT IT WAS NOT STRONG ENOUGH TO RAISE ANY CONCERN. ALMOST LIKE A CAP GUN OR IZONE SMELL. PASSENGERS WERE ON BOARD AT THAT TIME, BUT WE HAD NO COMPLAINTS AND RECEIVED PRAISES FOR OUR FLIGHT. REMOVED THE ACM. NSTALLED CUSTOMER SUPPLIED REPAIRED ACM. OPERATED THE APU FOR TWO HOURS, NO STRONG OZONE-LIKE ODOR DETECTED IN THE CABIN AND NO SMOKE OR HAZE OBSERVED. OPS CHECKS SATISFACTORY PER AMM 21-52-00.