Yikes! no tool plus SL = grope city. One thing you can look at are the leveling sensors. there are 4 sensors. the car is at floor when the top and bottom are off and the middle 2 are on. a number of times I have fixed a floor level problem by adding duct tape to the top and bottom of the leveling magnets. It was like the surrounding surface became magnetized and the sensors would it pick up and throw off the floor level.
