Strange M6 Problem

[mdw3@leguin.acpub.duke.edu]

I recently had a srange problem with my M6, and was wondering if any 
of you had experienced the same, heard of such a problem, or have any 
notion what might be plaguing my camera.  On two frames of a recent 
roll of slide film shot indoors under artificial light (frames #5 and 
37), I found a vertically-oriented and sharply-defined streak of 
light (approx. 1mm wide, and tapering slightly).  Other than that, 
none of the frame is fogged, however, and the streak does not 
continue into the sprocket-holes, indicating that the leak must have 
occurred from the front of the camera.  I am dumbfounded (as is the 
local repair shop).  Furthermore, the streak occured at different 
locations on the two frames that were affected by the problem. FYI,  
I was shooting at 1/50th sec. f2 with 64 speed film.  I am reluctant 
to send my camera for repairs with so little evidence to go on.  Thanks in 
advance for any help any of you might be able to offer.

Michael Weisberg