craftsman 1/2 hp battery key pad ok / remotes & car not working - OR after programming they are ok - but now key pad NG . (when all did work only the key pad would be able to close door.) ONE sensor ok green light - not seeing other light at all - if that is the problem - do I change just the one baulb is it a special baulb? I have no instruction wiring info at all on it - about 15 years old.