mitsubishi wt-42413

Hello. I recently was watching television and I heard a pop and the telivision went out. I took the back off so I could see what had happened. When I press the on button, the center lower bulb/lamp (faint orange) flickers for a second or two and then goes out. Is this a bulb that has gone bad? If so, where could I find a replacement for it at a reasonable price. This set is definately worth keeping if it is just a lamp? Please help.  Thanks