Opened my pool today and I have a constant flow out of my discharge pipe when the multiport is set to filter. Tried going through backwash, rinse and waste, then back to filter but still have significant flow out of the discharge line. I also have a small leak at the base of the sand filter and the multiport inflow/outflow. Just wondering, do I need a new multiport or can I replace some internals and be fine. Not sure how old the multiport is. We have been here 12 years and never had an issue. So it is at least 13 years old. Including some pics. It is a Hayward but I can no longer make out much of anything on the valve. Any idea what model?