Kowa Six Medium Format Camera Not Working

Film advances. Shutter fires. Waist Level Finder works. Aperture and focus rings move smoothly. Preview lever on lens works.
The lens has a moderate amount of fungus. The shutter speeds arent accurate – at least the slow speeds arent. The film door is difficult to close. With film loaded the film counter works but after 6 or 7 frames the film didnt advance anymore (tested with one roll only). The tip of the cable release which connects to the camera shutter is damaged.