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I've got Shimano Deore shifters like the one on the picture
and XT rear derailleur.
The shifter and the derailleur work perfectly well, the chain and the cassette are quite new. Bit the problem is that the indicator is stuck on the "high gear" - at the right and is not moving.
Should I replace it or can it be fixed?
Remove those two screws visible in the picture and lift off the indicator. It may be that the mechanism to move the indicator has become dislodged.
You could, as I do remove the indicator completely. Sometimes underneath there is a blanking plate you can use to cover the hole. You don't need to see which gear you are in and it means you can move the lever closer to your brakes for a tidier bar layout.
I opened an alfine shifter wrongly to change the inner cable recently.
The indicator mechanism is an incredibly lightweight and flimsy series of plastic levers and a cam.
The details will probably vary, but to fix it I had to take off the top cover (2 screws) and then used a length of sewing cotton looped around a lever to hold it back, while I reassembled the top cover... the fingers were too fat to do it.
It's quite easy to take apart with just a couple of screws. I have those indicators but I took them off to arrange my cockpit better. If you're in the U.K. I don't mind posting them to you if you can't fix them.
If you were to remove them, you'll need the blanking plates to cover the mechanism underneath.
