Have a mercruiser 165 - trim is giving a problem - the pump oil is milky and I see very small blurbs of h/oil in water when trim is fully extended. When on land looking for an oil leak can not find it! Don't want to replace the cylinder if it's not nessasary -and do not see any leaks in the lines - any body have a suggestions of other place to look. Trim still works but tends to fade under power.