We have a 2019 High Country also... had a roof leak in the living room area also...just rear of the A/C at a ceiling batt strip. Found that the factory had made the hole for the A/C too large and the gasket under the A/C was drooping down into the larger hole, causing the leak. Technician had to remove the A/C and fill the void where the larger hole was. Replaced the gasket with new (since it had deformed into the void. The roofing was ok, just reattached it to the new filled area. If you are seeing water ponding around A/C, you may have the same issue.... just a thought. Lucky for us, our unit was still under warranty, and Keystone picked up the tab on the repair, and even a later check-up (5 months later) to verify everything was ok, and to replace the stained ceiling strip. You might want to contact Keystone Customer Service directly on coverage rather than taking CW's word for it.. we have found that Keystone C/S is much better to deal with than some of the dealers.
William and Susan - Delaware, OH
2019 Montana High Country 331RL
B&W Patriot 18k Slider / 2018 GMC Sierra 3500HD SW