As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU INFLIGHT MIA TO BGI - PASSENGERS REPORTED SEEING SPARKS AT FLOOR VENTS BY RIGHT WING EXIT ROWS. PASSENGERS AND FLIGHT ATTENDANTS IN AREA SMELLED SMOKE. LANDED SJU WITHOUT INCIDENT. FOUND ROW 20DEF LOWER VENT PANEL POWERPORT POWER SUPPLY BOX SMELLED BURNED. REPLACED ROW 20DEF LOWER VENT PANEL POWERPORT POWER SUPPLY. SYSTEM GROUND CHECKED NORMAL OPERATION.