FDX 1293 Why Divert ?

Noticed FDX1293 (RST-MEM) making a wide right turn over North Central Iowa tonight, checked it out and it’s a diversion to FSD. Any way to find out the reason ?

I’m guessing that the aircraft at FSD had a mechanical and the RST flight was called to divert to FSD to pick up its cargo and take it to MEM.