Open up a Intel iMac All in One (Late 2006)?

This iMac just went out of warranty and the airport card is acting flaky. Other Macs in the house see the network fine. iStumbler on the suspect iMac shows signal for a few minutes, then none, then signal for a few minutes, etc.

I was thinking I'd reseat the airport card and check the antenna connection, but I haven't worked on this model iMac. I seem to remember that Apple made the Intel iMacs very NON-user-serviceable.

Anyone have a link to a how-to on opening and servicing this model?

Thanks,

Steve