I need opinions from people more experienced than myself. My Pentair Intellichlor IC40 salt cell has a red flow light. I took out the flow switch and visually inspected it and according to pictures I've seen nothing is broken on it. I acid washed the cell although it didn't look dirty. Backwashed a couple of times. Chemicals and salt all within normal range. When I first turn the pump on the flow light is green and stays green for several minutes then turns red and stays red. My cell is a full 5yrs old and the local pool store told me it wasn't worth trying a new flow switch on a cell that age nor having a service person come out. Any suggestions would be appreciated.