As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD T255/31MAY - PASSENGER REPORTED SPARKS AND SMOKE FROM UNDER SEAT. REMOVED VENT PANELS AT SEATS 15F AND 16F AND FOUND AN APPARENT BEVERAGE SPILL ALONG WALL WITH SOME FLUID COMING IN CONTACT WITH A POWER PORT. REPLACED POWER PORT FROM 15DEF AND 17DEF, CONNECTORS, AND HARNESSES FROM POWER SUPPLY.