Well, after all this I went looking. Sure as shit the damn crimp on the oil line was pressed against the rear brake line. Between pressure and heat it caused wear almost all the way through. I added a split rubber sleeve protector to the worn area but on a ride today it failed with a slow leak as shown with testing with hard brake pressure. This showed the peddle slowly moving down and it has been for a while now with wet line under the frame rail from previous rides. I don't use the rears aggressively so this is why I didn't notice it. Was going to be a winter replacement but now I need to fix it. Not in stock so about 2-3 weeks and about $185. I suggest every one taking a good close look at this area and at least add a protector sleeve to the line. What a pain in the ass it will be to change . Bike is a 2013 DX. Update. Got the line off and here is the oil cooler line imprints to the point of failure.