I have a 2006 Volvo Penta 5.0GXi-G engine and I cannot find the engine anodes. I have a service manual that points to where they should be, but my engine seems to be different. I purchased the boat from the previous owner who had the boat in fresh water. The outdrive started to corrode before I realized it was fitted with the wrong anodes. I have now correctly replaced with seawater anodes but want to be sure any anodes on the engine are also checked.