I just purchased a Leica CM locally and now I'm seeing that the LEDs in the viewfinder do not come on like they are supposed to i.e. my viewfinder is blank. I've tried changing the battery to a fresh one, but that didn't help. Does anyone know of any troubleshooting I can do? I don't see anywhere in the manual that says you can turn the LEDs off. I'm thinking they are no longer working. 