I have a customer that purchased a ps50 from me and is having trouble with the blower. The stove runs great on low medium and high as far as the flame is concerned. But there is hardly any noticeable difference on the blower speed from low to medium. Unit is brand new off my showroom floor, never been ran or installed. I called tech. All the wires are in the correct order. Line voltage coming in is 119. Voltage to blower on low is 81, medium is 89, high is 119. So the control board is breaking it down like it should. I installed a new convection blower and control board but no differences made. ANY HELP IS GREATLY APPRECIATED.