What was found
SMOKE IN COCKPIT COMING FROM AIR VENTS LEVEL CRUISE FL 230 FA REPORTED LOUD GRINDING NOISE FROM UNDER WING AREA AROUND SAME TIME AS SMOKE EVENT. C/A-INSPECTED FOUND NUM 1 PACK ACM DAMAGED FAILURE. PERFORMED ETN-EM-72-034 COULDNT DUPLICATE SMOKE IN COCKPIT WHILE RUNNING PACK 2. REATTACHED DUCT IAW ETN-EM-21-056 CLOSED AND SECURED PANEL. FOUND ACM SEIZED REMOVED AND REPLACED IAW AMM 21-51-03 PERFORMED OPS CHECK IAW AMM 21-51-00-700-802-A OPS CHECK GOOD. FOUND DUAL TEMP CONTROL VLV TO HEAT EXCHANGER DUCT DAMAGED. REMOVED AND REPLACED DUAL TEMP CTRL VLV TO HEAT EXCHANGER DUCT IAW AMM 21-60-01 AND REMOVED AND REPLACED COUPLINGS AND CLAMPS IAW ETN-EM-21-056.OPC AND LEAK CHECK GOOD IAW AMM 21-51-00 MEL ITEM RESTORED.