First off wow! 225k! That is great to hear! If you have a couple of minutes can you post what you have done to the Trooper over the years?
My best guess to you problem is that your cliper slides are dirty and need to be cleaned, or one of your slides is bent.
If you have a bent slide, typically you will have to have the caliper replaced (normall they replace both sides; its bad to mix old with new when it comes to brakes).
-Ryan