Eh, they always lie to me about the things they "check" with their free 21 point inspections or whatever you want to call them. They don't check anything.

Last time I took it in (a week or so ago for an oil change), they marked that my oil was in good condition. So was my front differential. I wasn't aware I ever had one. Oddly enough, this "tech" who apparently had worked on XFs before didn't mark anything about my rear differential that does exist.