The GM Document ID is 2519705 but the document title is "10150 - Special Coverage Adjustment - Fuel Tank Quick Connector Leak."
It covers 2004 XLRs within the following VIN breakpoints: 45600796 through 45602844.
It also lists all the parts that may need replacement, like the fuel tanks, hoses, gaskets, Aux Fuel Feed and Return pipes. But tank replacement is the most likely fix for this problem.
GM sent letters out in August 2010 warning owners of the potential fuel odor leak and to bring their cars in if they started smelling gas. So it isn't a recall as much as a warning. The problem will be fixed for no charge within ten years of the age of the vehicle or 100k miles, whichever comes first.
Hope this helps!