What was found
LEFT ENGINE STARTED & APU SHUTDOWN, STARTED TAXI & CABIN STARTED FILLING WITH SMOKE, SUSPECT RT PACK OVERHEAT. FOLLOWED FIM TASK 21-22-00-810-806 & DETERMINED RT PACK OVERHEATED CREATING ODOR, NO SMOKE DETECTED. PERFORMED OPS CHECK OF NR 2 PACK IAW AMM 21-51-00, PACK OVERHEATED. OPS CHECKED PACK INLET PRESSURE SENSOR IAW AMM 21-53-10, OPS CHECKED GOOD. OPS CHECKED ACFT CONTROL PANEL IAW AMM 21-61-02, OPS CHECKED GOOD. CHECKED PACK INLET TEMP SENSOR, CHECKED GOOD. REMOVED AND REPLACED ACM IAW AMM 21-51-08, OPS AND LEAK CHECKED IAW AMM 20-51-00, OPS CHECKED GOOD, NO LEAKS.