Lifted up the seat to notice that the plywood had a black mold like matter two layers deep into the plywood and around the air release holes. The plywood was delaminating from the moisture. Dealer was great, one look and he ordered a new seat for me. Before I put the seat in I am pollying the plywood to resist the moisture that seems to always be there under the seat. Seems to be trapped by the rubber flap over the radiator access. The polly should protect the plywood from this contact moisture. Saw that others on the site have had the same problem.