As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1108 - AFTER LEVELING OFF AT 330, SMELLED SMOKE. NOTICED IT IN THE OVERHEAD MAP LIGHT. I WENT TO TURN THE LIGHT UP AND THE REOSTAT WAS VERY HOT TO THE TOUCH, PULLED THE C/B. REMOVED AND REPLACED CAPTAINS OVERHEAD LIGHT RHEOSTAT. (M)