What was found
SMOKE IN THE COCKPIT QRZ AT 16,000FT. VISUAL INDICATION OF SMOKE AND SMELL OF SMOKE. NO SMOKE PRESENT IN THE CABIN AREA. AFTER RUNNING COCKPIT FIRE/SMOKE/FUMES CHECKLIST SMOKE REDUCED AND AFTER LANDING AND REMOVING O2 AND SMOKE GOGGLES NO DISTINCT SMELL PRESENT ON GROUND. C/A-T/S LT SMOKE IN COCKPIT FOUND #1 PACK ACM SEIZED UP REMOVED AND REPLACED #1 PACK ACM IAW AMM 21-51-03-000-801 AND 21-51-03-400-801 AND PREFORMED EO-EM-2100-048 NO DEFECTS NOTED OPS CHECK GOOD.