What was found
AT THE GATE, USING HUFFER AIR, HOT AIR ODOR AND REPORTED HAZE IN THE CABIN. AFTER STARTING THE NR 1 ENGINE, DISCONNECTED EXTERNAL AIR AND SWITCHED TO ENGINE AIR, CABIN AIR SUPPLY TEMP HIGH. ENGINE SHUTDOWN. LEFT ACM FOUND LOW ON OIL, RIGHT ACM FOUND TO BE LOCKED UP. REPLACED BOTH ACMS AND COMPLIED WITH ODI PREVENTION PROCEDURES. COMPLETED VF WITH NO ISSUES.