Over the past year, my Supermax 19-38 has developed a problem. Even when taking light passes (0.010 - 0.005") on wider (8") boards, the conveyor will bog down and sometimes stop but the intellisand light never comes on. It behaves as if the conveyor motor is just not developing power. It didn't use to do this. When I first got it, I learned to watch for the intellisand light and reduce my pass if it came on. I contacted Laguna and they suggested the brushes which i checked. They are perfect. They then said to take the motor out for testing or replace the controller board. Both are pricey and I'm loathe to just replace them if it isn't warranted. Any advice?