u/Croes220

Since my last ride this week the shifter of the back derailleur needs a way longer stroke shifting from gear 3 to 2. It’s only with this gear. I checken the shifting cable and couldn’t see any breaks or frays. But I saw some grease and tiny soft strings as in the pictures. I read different things from just cleaning the shifters to replacing cables and holdings. What do you guys think? It’s a Shimano R8000 shifter with about 4000 miles in.