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They are the powershift version. The ratchet engagement got weaker and weaker and now doesn't engage at all. Thumb lever is springy, but the ratchet doesn't click through. I see the ergo bodies come up as spare parts so assumed the lower their parts like centaur would be a shifter body replacement. Do you have a service sheet? Otherwise I'll look into youtube or something.
Thankshallots
@Sam
They are completely serviceable, depending on type. What have you got?