Hi Charlie.
I did a bit of hunting on the Interwebs to try and find some documentation for your housing, but came up empty. Couldn't even find a useful photograph of the housing, and there was nothing useful on the Nexus website. Documentation has never been their strong suit, but not to worry, their housings are well made, robust, and reliable.
I've had three of their housings for several years for Nikon F4 and D2X cameras. All of them have thousands of dives on them, and with one exception, (a broken gland for the focus knob on my 200mm macro port,) have been trouble free tools. I do however have a few general notes that may be useful for you.
1) I don't tamper with any of the housing O-rings, and do not pull the housing apart for annual servicing. I've never replaced any of the main body O-rings, and others are only replaced when wear is readily apparent. Virtually all of my diving is made off of boats, so if you dive from the sandy shore, you may need to be even more vigilant.
2) Use the Nexus grease for the port O-rings, and keep those rings well lubricated. All of the ports that I own are the screw on type, as opposed to bayonet mounts. I do not remove these unless I fell the need, about as often as I see a blue Moon.
3) I can't clearly see how many latches your housing has. I'll assume that there are only a pair, one each on the right and left sides. To close the housing, secure both latches at the same time. Likewise, when opening the housing, release them both at the same time. If there are more than two latches, post up some more photos of the housing, and I'll provide some more commentary.
4) You may need to remove the plastic protective cover for the camera's LCD screen before you house it. Failure to do so may not allow the housing to close properly. I know that this was required for the D2X, but cannot be sure about your camera. Can't hurt to do so in any event.
5) Dive safely, have a mess of fun, make some wonderful images, be kind to children and small animals, and leave only bubbles behind you, (until you get a closed-circuit rebreather.)
