Just bought a 2004 boat with 225s, only 195 hours. They ran out great during the seatrial. After purchase, I had both engines serviced including oil change, new impellers, thermostats and lower unit oil change. Both run great. Then I notice oil leaking from small holes located on the lower units as the boat is sitting in the rack. At first the engines were tilted up and it was running from two upper holes, then when I tilted them down, it came from two identical holes just below the cavitation plate. Anybody know what this means? What are these holes for?