Wondering if anyone with a composite transom has experienced any issues? I have a '08 Cabrio 274 which I believe uses Coosa board in the transom. Does not leak at all while docked but takes on water when I'm out running it. Maybe 1 gallon per hour or less. Have not found any leaks in the waterlines or drain plugs. Could be that pressure on the transom while underway is allowing leakage. Sounds very solid using the knock test so I don't think there is delamination. Mechanic tested it on land while the engine was out and determined there is no Y pipe leakage and checked the gimbal seal to the best of his ability and found nothing. Bellows are brand new and I don't see leakage around the driveshaft to gimbal housing area. Thanks