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jontea
@GideonPARANOID
The left shifter for the front derailleur has started massively playing up. It's Shimano R8020 & won't shift up unless I pull it in slightly to brake & only push only the outer paddle, not the inner one too as you're supposed to. Spent a few nights staring into the shifter & trying various combinations of things but nothing seems to have worked. Frustratingly, it seems to work okay when the bike is upsidedown (when it's the easiest to debug), but not when it's the right way up, suggesting that something's come loose. I reckon it's on the upper side of the shifter though as it's impossible to see.
I think I'm going to have to take it to a shop, which will hopefully open it up & resolve it. I've looked for technical diagrams of them but there's nothing detailed enough on the Shimano website. Kind of expecting to have to buy a whole new shifter for a whole shedload of money which I'm loath to do. Maybe I'll just go 1x.