Hello, I recently purchased a 2017 coachman pursuit 31SB. I really love this motorhome. I am pleased that it has a six speed transmission because that seems to make a big difference in the sound level in the coach. However I want to add sound insulation to the underside of the doghouse. There are three Allen head fasteners apparently holding it on. I am afraid to just pry them off and break some thing. Turning them seems to do nothing. Will someone tell me how to remove these fasteners? Thank you