I have a Culligan 812 water softener , that continuiously discharges a small trickle of water even when not recharging. Culligan rep says it's probably a bad seal and qouted $189 to repair it. That seems excessive to me, but what do I know? Question; is installing a seal kit something an amature can do, and if so, where can I get a kit, how do I install it, and any other suggestions?

Many Thanks!