Noticed on my first trip with the new 2015 4100 King, that I had a rust stain in my truck bed. On further inspection, I noticed it was coming from the inside of the pinbox. There are 2 holes on top of the box that are open for water to drain into and looks to be just one drain hole out the bottom. I'm thinking these holes were from when they included the plastic cover that used to be on top of the pinbox. Any ideas? I have it covered right now with electrical tape just to try to keep it from water getting back in there. This hauler only come off the line less then 2 months ago. Thanks