Manuals are going to be a bit more difficult. They printed them, but finding them is another matter. agtannenbaum.com is the only one that comes to mind.
I know there are a few a fe sites that handle the Pro Audio repair parts, they might be able to get some of the video parts you may need. Brent Jesse comes to mind- http://www.audiotubes.com/
: Hello, I just bought real cheap an old professional-grade video recorder. Uses 1 inch Cassette tape, the whole thing. It's a Panasonic NV-9500. It needs some going over, which having done so many times with consumer grade video and tape recorders, I know I can do myself. The problem is, I want to replace parts, like belts, friction bands, etc. A bonus would be to get a actual manual. Have I asked Panasonic yet? No. I am going to, but I suspect the dweebs there will claim they never made it, it's too old to bother with, whatever. Any suggestions? I live in the greater Los Angeles area, but will consider other areas if need be. Thanks for any help!