What was found
ON TAXI-IN, CONTROLLER CAB TEMP SHOT TO 40 DEG C, WOULD NOT RESPOND TO FULL COLD ON CONTROL KNOB ASSOCIATED W/ ODOR OF BURNING. ACFT GROUNDED. RAN PACKS CONFIRMED LT PACK OVERHEAT, NO AIR FLOW THROUGH RAM AIR INTAKE. LOUVERS AND RAM AIR DOORS FULL OPEN, ACM NOT TURNING EITHER. R & R LT PACK FLOW CONTROL AND SHUTOFF VALVE AS REQUIRED REF AMM 21-51-01. WHILE WORKING THAT FOUND LT AIR CYCLE MACHINE TO BE SEIZED. R & R LT PACK ACM REF AMM 21-51-04. PERFORMED LEAK CK AND OPS CK, BOTH CK GOOD. GROUND VERIFICATION CHECKED GOOD.