I have a rear tire...9000 mi. on it. Not much tread left. I am trading the bike in, in a month. Just found a small head nail in the tire causing a very slow leak. Due to the thin tread I do not plan on riding it any more. Just to the dealer on trade in day. The question is...Should I pull the nail and plug the tire or leave it in? The dealer has been told the tire leaks. 65 mi. trip to dealer.