Anyone out there have any adjusting info on one of these. Have one that we think has a bad speed control board but we replaced it with one we got from World and it made it worse. Put the old one back in and it will work ok for awhile but the board gets hot. Motor is fine, brushes are fine, doors are all free moving, no binding. Need to know what all of te adjusting pots/switches are for on this thing. Thanks.