What was found
DURING CRUISE, AN ELECTRICAL/PLASTIC INSULATION BURNING ODOR IN CABIN, AND A VERY LIGHT HAZE OF SMOKE NOTICEABLE AGAINST INCOMING SUNLIGHT, CREW WAS ABLE TO LOCATE THE SOURCE AREA, LOWER SIDEWALL ADJACENT TO SEAT NR 4, LOCATION THAT ALSO PRESENTS AN AREA OF DETACHED CARPET LINER. REMOVED THE FAILED FLOOR TRACK SWITCH DUE TO SWITCH STUCK CLOSED, OVERHEATING SEAT MOTOR. INSTALLED A NEW SWITCH, POWERED ON ACFT & ALLOWED INTERIOR TO BOOT. PERFORMED OPS CHECKS OF THE FLOOR TRACKING SWITCH & OPS CHECKS SATISFACTORY. CHECKED MOTOR BELOW THE SEAT AND VERIFIED IT IS STAYING COOL & NO LONGER OVERHEATING. SECURED AC AS NEEDED. WORK PERFORMED IAW CMM 25-20-72.