Our 2005 42DSO4 had a V shaped bracket mounted to the wall. Seems like there was a long handle Allen type tool in the coach but there was no screw. We began lifting one side of the tv then the other, placing books as spacers, slowly working the tv up till the tv bracket cleared the wall mount. Make sure all your cables are completely loose. It will be much heavier than you think so have plenty of help when it clears. Ours had a slot to the roof for clearance but I have read some cases where the bottom of a shelf had to be removed. Hope this helps.
"as for me and my house, we will serve the LORD."
Joshua 24:15