I bought 2004 GS last year and found out tank valves that won't seal closed. I always get drainage when I uncap the system. I've asked my service guy to replace the valves but he's hesitant to do that since he can't find specific drawings to show location and direction on the system. Has anyone done this or had it done? I've tried to flush and flush but if there's tp or other debris in the system it won't all come out. I always get something out of the black tank after several dozen flushings. I think the previous owners used regular tp
One suggestion was to attach a Flush King adaptor and leave it so that I don't get a face full when I take the cap off for hookup.