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My Petri mf4 suddenly stopped working. I can't advance the frame and I can't fire the shutter. The internal electronics seem to work since the LEDs in the viewfinder are lighting up. I tried firing the shutter via the normal shutter release button and via a cable release but both didn't work. I suspect that the film advance lever got stuck somehow and thus can't advance. Got any pointers on how I would go about fixing it? The mf-4 was such a pleasant camera to use - the mirror slap on that thing was crisp as hell.