Mitsubishi vs-50vf1 52" big screen tv

hello i have a mitsubishi vs-50vf1 52" big screen rear projectional TV. my problem is the screen is alittle darker than normal and it has a curve at the top and the bottom. the curves curve inward toward the center. i have heard of service menus. don't know how to get to them will this fix my problem? if not what should i do or consider? thanks