Getting a new TP2 - what bad things to look for in a referb

[wizardknight]

My usb port stopped transmitting data, but it was still charging the phone. I went into a sprint store to have the local tech verify my conclusions suspecting a bad usb port, and when they could not figure out the issue they offered to exchange the phone for a referb for $35+Tax. I decided that it was a fair price and accepted.

Now I know that there have been issues with the usb ports, and oil marks on the screen. Is there anything else I should look for while I am in the 30 day warranty period?

I don't mind breaking out my voodoo skirt, and chicken bones. I want to make sure there are no hidden demons in the referb if possible.