As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APPROACH INTO PHL, SMELL OF SMOKE WAS NOTICED COMING FROM OVERHEAD SEAT 1DF. MAINTENANCE INSPECTED AND FOUND PSU 1DF AT FAULT. THE PSU WAS ELECTRICALLY ISOLATED. SUBSEQUENTLY THE PSU WAS REMOVED AND REPLACED. AIRCRAFT RETURNED TO SERVICE. (M)