As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A ROUTINE POST-FLIGHT INSPECTION, SMOKE WAS FOUND COMING FROM BEHIND THE VALANCE PANEL AREA NEAR FWD LT EMERG EXIT WINDOW. FOUND PROTECTED POWER SUPPLY (PPU) FOR ONE OF THE UPWASH FLUORESCENT LIGHT BULBS HAD BEEN DEFECTIVE. SIMILAR OCCCURRENCE ON 9-99 ON SAME ACFT WITH SAME P/N PPU (AL-5112), SN 2526. (X)