Yesterday I noticed a small drop of gear oil on the skeg of my 200 SHO. It's leaking from the top screw. I removed the screw and a small amount of oil came out. The boat has been serviced and I've had it out a month ago and it has sat covered for a month. No leaks until yesterday. I've washed and waxed it a couple times on nice days and I'm pretty sure I would have noticed a leak. Any ideas on why it suddenly decided to drip? Thanks!