I know its a pain, but in “Most” situations where you have an issue and are unsure the cause, you can resort to a flushing and finish with a dose of feed water / nutes.
Going from what I can see in the pictures, ( and please remember, I am no expert, just offering thoughts )
You are probably right about the light damaged leaves. If they are as brown and dead as they look in the pic you can remove them. If they are that far gone, they will not recover, but the plant will loose light from the shade of the dead leaves ( the burnt looking area at the top)
The yellowing leaves in the mid height Kind of ( to me ) look like what happens during a stressed point in the plants life. When those leaves unfolded were they healthy color and shape? if so, something happened at that time in the plants life, and they are the result,/ over trimmed? over or under watered? something happened at that point as they actually go all the way across the plant. But… the leaves above that point look like the plant recovered from whatever the cause was. I would give more veg time so the plant can put out more growth above to make up for what will be missing from the middle (does that make sense?..) I don’t see serious necrosis in the yellowed leaves so that leads me back to a point of stress… but you will loose those leaves. And when most of the green is gone from them, if they need removed to allow light to lower areas, do it.
Keep in mind, when growing photo’s instead of auto’s, if an area of the plant is lost from a stressed time, or other issue, you can veg to grow a bit bigger and make up for the earlier loss just have a bigger plant.
On my screen, it looks like you may have more yellowing starting in the lower leaves also. Add this to the above and I start thinking nute deficiency. I would NOT just go in and feed. I would flush first, just incase, then finish the flush with proper mix of nutes.
I am only offering these thoughts because you tagged me in. Please keep in mind that while I would like to be helpful, there are most everyone here has way more experience in this than I do. I am a beginner also. Only on my third serious grow.
Sum it up, you can consider what I replied here, but DO NOT run in and follow these guesses, wait for a more experienced grower to respond