Purchasing a "perfect coach" is as rare as unicorns! Good for those that have purchased the rare unicorn
These are very complex units with so many things to go ary along the assembly line. So many mishaps that don't get caught on the final inspections both in the factory and at the customer delivery. That said, if your not the handy type that has the ability and the willingness to make the corrections yourself, being at the mercy of the dealer can be very frustrating, time consuming and often disappointing.
In your case I agree that a planned appointment at the factory with a comprehensive detailed list with a focus on the major issues (leaks) may be your best advice.
Our 2016 has had literally dozens of minor issues that I've addressed myself. Some of the issues just have have me shaking my head at the assembly process. Items like having no flange gasket on the toilet (talk about leaks
); headlight hanging on by only one screw; medicine cabinet door falling off the hinges; and the list goes on and on. But, as long as the many problems are relatively minor I prefer to fix them myself and to be thankful to avoid the major issues. I really, really want to avoid dealer repairs as much as I can.
Bottom line is that while Winnebago will likely always have manufacturing problems, all the other comparable coach manufacturers will also have essentially the same manufacturing quality issues...some better...some worse and then there's the occasional horror story. Regardless, I'm convinced it's simply the nature of this complex manufacturing industry. So many complex chassis systems and SO many vendor supplied pieces of equipment that have potential for failure.
Best of luck with all your repairs, and do hang in there. It may be less stressful for you if you can try to focus on one problem at a time.