Im not an attorney either, but I had a problem with a builder and warranty company mostly regarding foundation failure. I learned it's way too common in new/newer homes these days, thanks to shoddy construction. I got help from
http://www.hadd.com in the form of information. A lot of builders tell homeowners to report this to their homeowners insurance and IMO that's a mistake. If you read your homeowners insurance policy it probably excludes this problem. I know of very, very few instances where a homeowners policy covered it, and the problem is that once you report it, your house is forever on the CLUE report which can make it hard to insure or sell. Your state might have laws that hold the builder accountable for longer than the typical one year builder's warranty. You'll have to find out from likely more than one or two lawyer consultations what your rights really are in your state and in your situation.
Check your policies for exclusions, the potentially dangerous arbitration clause, etc. Good luck. I agree with the other person who said a house of this age should not have this problem. BTW, shortcutting on the drainage system is a common builder problem, which could be the cause of your problem but you will probably need to hire a structural engineer experienced with foundation problems to be sure. In my area this can cost from $300 to well over a thousand depending on what they do.