The Cape Dory Board

HI EVERYONE, I HOPE YOU CAN GIVE ME SOME GOOD ADVISE ON WHAT I SHOULD REPLACE TO HELP ALEVIATE A STINKY SMELL BELOW. WE REPLACED THE HEAD ALREADY ( SOMEONE PUMPED IT IN THE CLOSED POSITION) WE'VE HAD HER 5 YEARS NOW AND I'D BET NO ONE EVER DID ANY MAINTANANCE ON HER. WE'VE TACKLED ALL THE WIRING, RE...