jw,
Mine went out about a year after I bought it. That was 6 years ago, and (as far as I can tell) the Earth is still spinning on its axis; the birds are still singing; the fishes are still swimming; and the squirrels are still trying to steal food from my bird feeders . . . and everything else in the TT is operating as it should.
Although someone with more Jayco Knowledge than I have may chime in to the contrary, as far as I can tell, it's either that the bulb has burned out. or the wire that feeds the bulb has broken from the constant movement of opening & closing the flap. I wouldn't worry about it!