working on a easi-40 s/n EF-A-04-31291 the right outrigger wheel will go straight at when the red centering button on the glass is pressed then turn side to side no matter were the steer wheel is located. the GB code appears after the self test and the steering code appears when you turn the wheel full to one side or the other.i didn't put much time in trouble shooting the unit because customer was shutting down for the night by the time I got there.befor I go back I want to have a thought as to were to start. also how do I get into the dash to do the steering learn on the unit.