I have a 2007 Peterbilt 379 with 282,000 miles on it. It seems my upper dash face from about the middle of the steering wheel to the glove box has come loose. I can grab the top of the dash and it almost lays back in my lap. Any suggestion on finding how the dash attaches to the front of the cab. Do I need to take the main instrument cluster out to find how it attaches? Any help would be appreciated.