What was found
CLE - FLT 3138 - AFTER TAKEOFF, THE CREW REPORTED SMOKE IN THE COCKPIT. THE AIRCRAFT RETURNED TO CLEVELAND WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED LEFT NACELLE WEIGHT ON WHEELS PROXIMITY SENSOR CANNON PLUG (1J0318) IAW EMB WIRING MANUAL. OPERATIONAL CHECKS WERE GOOD IAW 32-00-02. OPERATIONAL CHECKS WERE ALSO PERFORMED ON AIRCONDITIONING SYSTEM IAW 21-50-00. THE AIRCRAFT WAS RELEASED FOR SERVICE. (M)