There are four torx head screws, remove those and the cover lifts off. There is a rubber gasket around the cover, be sure it's in good position when reinstalling. If there is a Harbor Freight near you they have torx head sockets and wrenches. HF also has a folding model with many different sizes, very handy to keep in the RV.
__________________ USMC Veteran
FMCA 101070S Dave & Myra One day your life will flash before your eyes,
make sure it's worth watching!