Built new pool 5 years ago and had Paramount 6 valve in-floor cleaning system installed. Worked great until about a year ago, when I noticed that it was not cycling from one zone to the next; instead one zone of nozzles was stuck up. I took the cover off the valve module and cleaned the inside with fresh water. Worked fine until about a month ago, when a zone was stuck up again. Fixed it the same way, but now it's stuck again. Should I replace the whole valve module or is there a better way to unstick those valves so that it cycles through the zones.