A couple weeks ago I got an absolutely mint Yashica Mat 124. The shutter sounded right on, and everything worked fine, including the self timer. It may never have been used, in fact, because it was found in a dentist's estate and the family never saw him with it. The case and focusing screen are pristine. Regardless, today I was preparing to load it and use it, but the shutter simply will not fire. I even tried the self timer, and that won't work either. I hesitate to send it back if it's something minor. Does anyone know a good, reasonable repair person for this Yashica Mat 124? Or have any idea to get the shutter to work? The film advanced perfectly. The shutter button does not depress until I advance the film again, then the shutter button depresses and releases the film to advance again, but the shutter does NOT fire.Any ideas at all?