FDX1214 B722/W - KLFT to KMEM diverted to...KLFT?

This was an odd occurrence...update says it diverted...back to LFT? Sure enough, here she came back. I heard it passing over on downwind and looked out...nothing appeared unusual. Warning light? Engine took a dump? Something on the MEL broke or quit working? I'm just curious. Anybody out there know what it could be? Any info pass it along! C4Net "Day after day, flight after flight...when something is different, it just ain't right!" (flightaware.com) Mais...