I have an xlt 3255 oven, approximately 6 years old, that will not fire. We called xlt and bought a new spark box, was not the problem. Xlt sent a tech out who spent over 10 hours going through the oven, he replaced one of the other electronic boards (didn't work), ended up getting yet another spark box (didn't work), a new ignition wire with igniter(didn't work), and finally a 2nd ignition wire and igniter that didn't work. After it seemed increasingly clear the tech was just wildly guessing at what was wrong I stopped having him look at it. So I know come to you fine folks in hopes of fixing this thing. What happens is you turn the oven on, the ignition box blinks one red light and sends a small spark, after a few moments the spark box begins blinking 3 times stating it has not fired. If I pull the ignition wire off the spark box and hold it a small distance away I can see the spark box fire several arcs into the wire. If I also pull the igniter off and hold it next to a metal grounded object I can see it fire several arcs. So it seems there is spark getting up to the ignitor ( at least when I have it off) but I can not get it to fire the oven. Any thoughts? Really want to get this thing pumping again.