I found the pdf of the user manual for the 237 I had. If you would like a copy, send my a Private Message with your email and I'll send you a copy. To do that, left click on my user name and select "send a private message".
I've got a lot of manuals as I tried hard to get one for each machine I owned. The plan was to eventually scan then and post them online on another forum so that they are free to anyone that wants one.