I just got my hands on a Riso 3750 with a SC5500 Rip. I've got it running connected under Win XP Pro and its doing ok. I had a 2750 back in the day, when they were the newest thing, and I had always regretted getting rid of it. Anyways, I'm looking for a Service Manual ( and the tech bulletins) for the 3750 as the company that used to do service here locally, doesn't handle RISO anymore. If anyone can help me out, I'd really appreciate it. If nothing else a list of the test codes would be really handy. Thanks!