Welcome to iRV2 and the Newmar family.
Could you add your coach year to your post , or set up a signature line .
The retaining wooden surround on my 99 is held in place with three screws on each side , that are accessed with the cupboard doors open . After the screws are removed the surround slides out and then the TV .
NOTE !!! The TV is damn heavy , have big strong help ready to catch it .
A signature line will automatically post your RV info below your posts as mine does below this one.