I have a 94 EXT 580. The jackshaft has rubbed its way through the hoses that feed the rear heat exchangers. Seems like a poor design to have the hose run underneath the spinning shaft. I had this repaired last year, but it has already gone through the hoses. They did put a thin metal plate between the shaft and hoses. Looks like that is gone also. Is this a common thing or was it not repaired correctly? Thanks.