My Chorus 9 Speed Ergo-power (~2005) got inaccurate during shifting. The local bike repairman couldn't get the dérailleur to shift properly.
Sometimes the chain don't jump down or up after shifting. Some gears are skipped and the pressure points got weak.
What parts do I need to replace? Is it maybe a better idea to replace the whole Shifters with a available new 9 Speed Ergopower like the Xenon?