Light leak or dev problem? Can anyone help? (photo attached)

IMO, if the lab and you both had the same problem, it isn't a development issue. What would the odds be of that?
 
with light leak, the frames would look different depending on how much time they were sitting in front of the leak. why the sprocket marks if a light leak?
 
Looks like leaking back door. On your test roll, tape the hinge side of the door with black masking tape or some-such and check if the effect is still there. If not, the light leak is from there.
 
+2 with the scanning response from Greyscale.

Self-question:
How would you get a few sprocket holes showing when the film is still in the camera? was my first and only thought. The scanner idea seems pretty good!
 
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