Replacement Primary Harness for Classic Edge models with Firestar II controller and air intake solenoids with affected serial numbers: Edge 350 with serial # G300344 and up; Edge 550 with serial # G500961 and up; Edge 750 with serial # G700683 and up. Replacement Primary Harness for models with Integrated Firestar controller and air intake stepper motors with affected serial numbers:: All Edge 350/550/750 Titanium (GS) serial numbers. All Edge 350/550/750 Titanium HD (GF) serial numbers. All Edge 360/560/760 Titanium (GX) serial numbers. All CleanFire Titanium (WX) serial numbers.