As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGERS AND F/A SMELLED SMOKE FROM THE READING LIGHT AT SEAT 3E. PASSENGER ALSO HEARD A POPPING NOISE. THE LIGHT WAS TURNED OFF AND THE ODOR WENT AWAY. PERFORMED A GVI OF THE PSU FOR DEFECTS, NONE NOTED. AS A PRECAUTION REPLACED THE 3E PSU IAW AMM TASK 25-28-00-000-801/-400-801. CHECKED GOOD. NO SMOKE OR POPPING NOISES HEARD. RETURNED TO SERVICE.