I was out on a trail for the last few days and really worked the power steering. It was 90 degrees, climbing out of a canyon on switch backs that took 4 point turns for several hours. At one point I looked under the truck and had a very small drip. Later I found it to be my power steering. It was a little wet around the top of the reseaviour. Almost like it had gotten hot and built to much pressure and over flowed some. The pump and lines have been replaced rebuilt. No wine or noise, no other leaks, working great. Is this normal under hard use? Did I over fill it a bit? Does the cap have a seal that wears out?