I have a beautiful old rolleiflex automat III which occasionally gave light leaks. After some use and looking over my rolls of negatives I've figured out that they occur when I focus really close; ie, some internal bellows or light baffle must be leaking when the lens plate moves all the way forward.

Any tips for repair? I have a roll of film in it now that I've got to use up (on distant subjects ), so I haven't been able to look inside to figure out if I can see anything obvious, but I don't remember anything like this.