Hi, So I just bought a Mamiya RZ67 used from KEH. I got a new battery, and it worked fine, and I used it to shoot a couple rolls of film. Now the status lights on the viewfinder aren't lighting up, and I changed the battery, and they still don't work Shutter works but if I put it on 8 seconds it still goes quickly so I think it's not getting any power. Anyone have any ideas what could be wrong or how to fix it? I'm not happy about this because I literally only got a chance to shoot two rolls of film with it.