What was found
SULFUR SMELL FOR 5 SECONDS WITH BOTH ENGINES RUNNING BLEED AUTO PACKS ON.APU OFF. CAME BACK APPLYING TAXI POWER SMOKE FILLED CABIN.L PACK TURN OFF. NO CHANGE IN CABIN STATUS EVACUATION INITIATED. SMOKE STOPPED AFTER CHECK LIST RAN. / BOTH ENGINE RUNING RUNNING AND AFTER APU SHUT DOWN. / REMOVED AND REPLACED LH ACM IAW AMM 21-51-08-000/400-801-A01. PERFORMED OPS CHECK OF AIR CONDITIONING DISTRIBUTION SYSTEM IAW AMM 21-51-00-710-801-A01. OPS CHECK GOOD, NO SMELLS, FAULTS OR LEAKS NOTED AT THIS TIME.