I have the flight manual and training manuals for the 1121, but not the maintenance manual. What, specifically, do you want to know?
Unfortunately, I won't be able to access my 1121 manuals until next week, but I could scan a page or two.
Given your screen name, I'm assuming it's under water? The differences between an 1121 and any other Commander would be pretty obvious, starting with the fact that the 1121 is a jet, so if it has props, it's not an 1121... and the 1121 is mid-wing, the others are all high wing. And the engines on the 1121 are located at the back of the airplane.