OK I need some help. I need a manual for a 1976 Post 42'. There are lots of little things that I don't know about this Yacht. I know I can figure out lots of this stuff with time but a manual would make it easier. I don't think they had a manual until sometimes in the 80s. I don't think a lot had changed from the mid 70s to the 80s. I have looked around on the Post page but I haven't been able to find anything. One of the things I need help figuring out now is the original bilge blower location. The current blower is not installed properly. It is currently hanging via some tie straps in a large square opening (opening 1 in the picture) There is no ducting attached to it. I have 2 new larger bilge blowers and tubing that I am going to install. There is another round opening (Opening 2 in the picture) that is located further toward the rear. I am wondering if that is the original blower location? Anyone know anything about this? I know there is a fresh air intake and and exhaust. I am just not sure which one is which.