Al, I don't think there is anything specific to look for on an 07' but if the unit had any of the "normal" quirks like, fresh water fill problems, shower leaks, kitchen sink leaks I'm sure they have been addressed.
There have been some changes on the model since then, so make sure you know that, if you have been looking at newer ones. The upstairs bed/bath have had the most and I might add they have been great changes, pocket doors, rounded corner, overhead TV position to list a few.
Good luck, Gary