My bet is pinholes in your bellows. You shot these in HARSH, RAW SUNLIGHT. You can't really ask for more light than that, unless you're putting a strobe head right next to the bellows
Take a small, but super bright flashlight, in a VERY dark room or closet, and shine the light into the corners of the bellows FROM THE INSIDE, pointing into the corners. Look at the bellows(do this operation while bellows are at full/normal extension), and note where the light leaks are. I use small pieces of white tape to mark the corners.
***On smaller cameras like this, I use a BORE LIGHT(yes, the kind you'd use to look down the barrel of a gun), as it has a 90º fiber optic bend, and is much smaller than my normal Surefire flashlight which can easily fit inside the diameter of the bellows on my larger LF cameras. My bore light is an attachment for my Surefire actually, but this light(below) is similar in style:
http://www.amazon.com/Browning-Micro.../dp/B002RC1MHO
Once done marking said pinholes, I fill them in(from the inside) using liquid electrical tape(the BLACK stuff in the jar from the home store) and a small throwaway modeling paint brush to "paint" into the leaky corners/pleats. I then leave the repaired areas to dry, leaving the bellows fully extended for a full 24hrs, preferably 48hr, so the repaired areas can cure. The main trick I've found is to NOT overdo it, small amounts can go a long way. And repairing the bellows from the inside helps keep things looking pretty
-Dan
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