I have an o3 SAN210 and thought that the only engine options were the ZR6 and PCM Excaliber.
Make sure your looking at the right manual.
http://www.planetnautique.com/CorrectCraftManuals/PCM%20Owners%20Manual2.pdf If your boat is like mine, page 55 will explain were the plugs are. They are brass and just screw out. The hose on the water pump just needs to be pulled and drained by loosening the hose clamp. The plug under the water pump is hard to see, so just feel for it with your hand. All the plugs look alike, but are not the same size. They are made of brass and have a square head on them. I hope this helps.