What was found
(CAN) REF SDR 20111107007, OCCURRENCE DATE NOV 5 2011. REJECTED TAKEOFF DUE TO LT NR 2 WINDOW OVERHEAT. INVESTIGATION FOUND WINDOW HEAT CONTROLLER COOLING HOLES WERE FOUND PLUGGED WITH DUST. CONTROLLER WAS CLEANED, TESTED & SWAPPED FROM POSITION NR 1 TO POSITION NR 2 FOR TROUBLESHOOTING. FLIGHT 2506 CREW DIVERTED DUE TO A RT NR 2 WINDOW OVERHEAT WHICH WAS ACCOMPANIED BY A BURNING SMELL. THE NR 2 WINDOW HEAT CONTROLLER, RT NR 2 WINDOW DUE TO SIGNS OF ARCING ALONG THE BUS BAR & CURLY CORD WAS REPLACED. PRIOR TO SWAPPING THE CONTROLLERS FOR TROUBLESHOOTING THERE WERE NO WINDOW OVERHEAT REPORT FOR THE RT SIDE.