Small brown papery areas along veins...help diagnose?

[emcd124]

I've been going through tons of photos trying to ID this, including the resources on the sticky, without luck. I have brown papery areas, concentrated along the veins of the leaves, small and elongated, no yellow or circular patterns. It seems to be concentrated on one or two branches at a time. Leaves otherwise appear unwilted or curled. The affected leaves are towards the lower third of the plant but are not the very lowest branch of leaves.

I had a soil test last year showing high to very high levels of all nutrients, and high OM, though my Ph is 7.5, which may be high enough to tie up some of the nutrients, so as far as I can tell from reading (I'm still pretty novice) nutrient deficiency could also be a cause.

I had aphids earlier in the season that I controlled by squishing. The leaf damage here appeared after the aphids were mostly gone. So far this has only appeared on two plants (Rutgers and Cherokee Purple), but I also have some irregular green/light green mottling on Gold Medal.

Thoughts?