Both of my gas caps on my 03 EPS are leaking at the vent. One started about two weeks ago, the other today. Neither tank is that full, I had been running less fuel since the first started doing this. That helped a little but not much. What exactly causes this? Is there something in the lid that goes bad? Is there an updated version available? What is list price on these jewels? I'd rather know what to expect when I go to the dealer to get them.