last week while using my pentax 67, i set the MLU and the mirror stuck in the up position. i pushed the reset button and it came down but the battery was dead. today, after replacing the battery, i shot 5 frames and the same thing happened. this time however, the reset button did not work. i unloaded the film in the darkroom and now i am stuck as to what to do. the exposure counter is stuck at 5 and the 2 procedures in manual to release the shutter without film in the camera are not working. any suggestions?