Watery soapy effect behind middle of screen? Help!

[callmewoof]

I searched and read about the problems with the touch pro 1 having this issue (rainbow circle?), but now it's happened on my wife's touch pro 2 today. There's a soapy/oily looking rectangle directly in the middle of the screen (covering half), visible in most light.

We have insurance, should I use it? I know the TP1 was a known issue, but what about the TP2? I've had bad experiences with lame sprint reps but if that's my best/only choice... Anyone have any insight? Thanks!