Bessa R2a advace lever stuck
So I finished the roll, removed the film, after couple of weeks I put the new film in, advanced the lever, wanted to press the shuter button - ooops, nothing. I thought batteries died - replaced with fresh ones (yes, put them correctly), still nothing. The advance lever is stuck in the "already advanced position" and the shutter button just presses through with no releasing of the shutter. There is no shutter speeds lit in the viewfinder - as if there is no battery or as if advance lever is not advanced (althouth it is). What is it? Electronics issue or just advance lever stuck in not fully advanced position which prevents shutter from firing? What do I do? Can I avoid a rendez vous with the professional retair shop?