What was found
WHEN ICE WAS ENCOUNTERED AT 26,000 FEET, THE ENGINE ANTI-ICE AND AIRFOIL ICE PROTECTION SYSTEM WAS ACTIVATED. IMMEDIATELY AFTERWARDS THE L&R AC TEMP HIGH LIGHTS, L&R ICE PROTECTION HIGH LIGHTS, ICE PROTECTION SUPPLY PRESSURE LIGHT AND AIRFOIL PROTECTION LIGHT ILLUMINATED AND SMOKE ENTERED THE COCKPIT. THE EFFECTED SYSTEMS WERE SHUTDOWN IAW WITH CHECKLIST PROCEDURES AND THE SMOKE CLEARED. THE AIRCRAFT WAS RETURNED TO ORD WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT AUGMENTATION VALVE AT FAULT. THE RT AUGMENTATION VALVE WAS REMOVED AND REPLACED IAW MM 36-10-01. BOTH ENGINES WERE RUN AND ALL SYSTEMS CHECKED GOOD.