Replace spider gasket, O-ring or whole multiport??

Hey all, over the weekend I started having a leak in the backwash valve and I'm lost as to what the cause may be. It initially started after I did a routine backwash and recharge of my DE filter. After starting the pump back again the backwash pipe had a substantial amount of water coming from it (steady stream). I turned off the pump, opened the multiport to see what was going on. The gasket looked fine, no warping or wearing visible. The O ring has an area where its not 100% sealed...

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