I took my boat in about 6 weeks ago with small oil leak on front top seam of lower unit, the business replaced the shift rod seal and also cleaned the carburetors. I got the boat back and ran it the next day for 15 minutes when it started making a clanking noise and died, I raised it out of the water and oil was pouring out from the same seam as the original leak. The business now says I'm looking at a new powerhead and is accepting no responsibility, anyone have a opinion on this?