I'd clean it up, change the fluid, and ride! Unless it's leaving a puddle on the ground, I wouldn't be too worried. Cleaning, filling, and riding is the easiest way to test it. :cool:
Those slow leaks can be hard to find. I have a couple going on now. Soap and water will work, with lot's of patience. The last new Bridgestone I carefully mounted a couple months ago, has a small leak somewhere. Takes a couple weeks to go down, so I just air it before I ride, and say screw it...
OK, because I'm too old and too lazy to hunt, if you put a "check" mark in the O2 sensor on Tune ECU, does that activate, or de-activate the O2 sensor ????
I have 2, 05's and 1, 2013 and there is a difference in the two. I'm too lazy to go measure at the moment, but will watch to see if any others test their bike. To me, the 2013 shifts a lot smoother than the 05's. Don't know why, just so...... And that bit of "slop" will bite you on the ass in...