I've got a Fox F100RLT 2004 fork and it's leaking from the top cap. The cap has never been removed from the fork before so why can it be leacking from there. I have attached a pic of the area where the oil is coming from. Looks like there are some unevenness where I have marked with a red ring. What can I do? Do I need a new cap or do I need to send it in?