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I think your problem might be deeper than that exploded view goes (inside the ratcheting part of the chonky top part of 'main lever assembly')
Yeah, I'm a bit stumped as to how I can access any of the actual mechanism. I'm picking up a groupset later off a mate, but figured I'd at least have a look as my brother is coming tonight and we were hoping to get out riding - so fixing the current shifter is preferable to switching over half the groupset.
It feels like one of the teeth has probably worn off, as I have clicks up and down on the two largest rings at the back, but I can't shift down beyond them. The shifters have had a long life, so can't complain too much, but it is a bit annoying to not even be able to get to the mechanism properly.
Found this:
https://www.youtube.com/watch?v=4PDGHoUZ38M
But it looks a bit beyond what I can be arsed with right now. Lots of springs and bits that are likely to be a total faff to get back together for potentially no gain.
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Nef
There are some similar issues with other STI levers. I wonder if they're the same as what you're experiencing.
My issue was with a few 6700 & 7900 levers not engaging on the up shifts.
There are a couple of similar threads to this:
https://www.lfgss.com/conversations/358022/
I think your problem might be deeper than that exploded view goes (inside the ratcheting part of the chonky top part of 'main lever assembly')