Weird Artifacts

From first roll of film shot in freshly CLA'd Kiev 88CM.

 

I dont know where these artifacts in the image came from. On the negative it looks like a light leak of some sort, but they do not show up on every image... Any ideas on the streaks? Light leaks or ghosts?

 

Kiev 88CM, 1/500 sec, F11. .Tri-X 400 (@ 400), HC110 1:119, 1hr stand with 5 min presoak

Done