I have a k machine with about 14000 hours that suddenly started giving high flow error and the conductivity rised to about 16. When troubleshooting I noticed the flow error comes in and out as the bc valves change cycles. Also noticed some "dribble" after every other cycle when checking the drain hose output flow.
I think it may be bad bc membranes or leaking bc valve. any ideas??

Could be CFS.

I would bet membranes with the amount of hours on machine.. However ORC has a good place to look as I have seen the CFS cause this problem.