What you really need for an evaluation is a good mechanic.
One of the best auto repair shops in town is Curts Auto on the west side of Phoenix. Not exactly Peoria, but not too far. It's a family run shop and well known for it's honesty. Several of the guys there are Jeepers. I have used them alot and highly recommend their work. They are highly rated by a number of other sources as well.
Website: Curts, Auto Repair Phoenix