Campagnolo 10 speed servicing

It's the levers that do the click, not the rear mech.

Unattach the cable from the rear mech, see if the lever still clicks. If it doesn't then its fucked and needs an overhaul.

If it does, it might be something in the rear mech. Clean and lube is your first task, then re-attach the cable and try re-indexing.

+1. A Clean, relube and re-terminate of the cable sorted me out once when I thought the ratchet had gone in one of my ergos.