Repairing a Silver Reed EZ 20 Typewriter?

I bought a Silver Reed EZ 20 electric typewriter from the 80s. I tested the machine and the only thing that does not work is advancing paper manually and with the auto key. When pressing the return key it does return, but the paper does not advance either. The platen works manually and with auto key, but paper does not advance. There are three smaller rollers (see arrows) behind the platen, they do not seem to roll. I am not sure if they should.