Concrete Step Repair

I have a set of concrete steps that are in need of repair, and need some advice on my options. The steps are fairly old (20+ years), are used as part of a walkway, and have what looks like precast concrete "stringers" on the sides. There are four steps total in this flight, and two have some damage to the fronts/edge. Another factor is that the steps are uneven - the bottom step has a rise of 4", and the other three have a rise of 8", and all are 12" deep.

I think the damage is reasonable to repair, but may look a bit funny due to differences in color/material. I could tear the steps out and replace, but I like the looks of the stringer on the sides.

Is there a way to even up (make them all 7" rise) and keep the stringers? Will I need to take out the steps completely and replace, or is there a way to put new concrete/material on top of the three bottom steps and still have it be durable?

Thanks in advance!

 

It might be easier to answer some of this if there were a picture to see.

Here is a link on repairing the steps themselves.

http://www.doityourself.com/concrete/concretestep.htm

http://www.quikrete.com/diy/faq_diy1.html#diy1

Hope this helps.