After replacing a damaged multi-function display we are now getting fault code AD-7. We can install the old display and the code disappears. The service manual clearly states that a "Engine and display ECU information clear" is required, no where in the service manual does it explain how to perform the procedure. I had my local dealer out for a service call on this code and the tech told me it would just go away....?? It hasn't. Any advise or help would be greatly appreciated