My boat has been stored for 6-7 months. I put new batteries in tonite ans cranked engine over a few times. I noticed gear oil leaking from around prop. Is the seals bad or is it just oil that has leaked down there during storage? It is a 1990 150 Evinrude.<br />Also how hard is it to replace the seals?<br />Can it be done at home or do i need to have a boat repair shop do it?<br /><br />Thanks 