might be able to help, I have a word document on my laptop with loads of praktica links to help my out with mine! can't get on it till later but will have a look. what praktica model do you posses that needs repairing?
the 2 most common problems (apparently) are with the film advance. One being that it gets jammed, and the other that the film doesn't get wound on the correct length, so that sometimes, there can be a large gap between 2 frames, and then no gap between the next two.
someone also said that shutters get issues, but I (stupidly) poked at my MTL's sshutters and lifted them up etc with my greasy fingers when I first got the camera (thats before I started learning about 'tography) still works fine, no times off or anything!
anyway, I now have to go and knock on wood just to make sure nothing happens to my darling praktica!