Well, it is modified cabinet since that is no the stock TV or woodworking below that. If anything that should have helped since it used to be a tube TV in there.
But who knows what they did to make that modification or what they removed. It is more than likely just that front fascia piece that is sagging. Can you put a square edge on it and see how far that bottom wood style is sagging?
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).