RevereWareParts.com has the manual on their website for free downloading.
I tested it out with just water a few weeks ago and it worked beautifully. (Barry and I shooed the kids out of the kitchen and watched it nervously, but it worked fine.) And today I actually used it for the first time to cook some chicken breasts in oil, herbs and a little water, and they came out gorgeous and fragrant and tender.
Another example of how they used to make stuff to last.