What was found
ON DEPARTURE AT 3000FT, SMOKE IN CABIN BETWEEN ROW 3 & 4 REPORTED. MX DROPPED PSU PANELS INSPECTED AREA, ELECTRICAL WIRING, BALLASTS, LIGHTS AND FOUND NO EVIDENCE OF ARCING OR ELECTRICAL SHORTS. PERFORMED SUCCESSFUL OPS CHECKS OF CABIN LIGHTNING WITH NO EVIDENCE OF HEAT OR SMOKE AND COULD NOT DUPLICATE. ACFT WAS APPROVED FOR RETURN TO SERVICE.