Well, removed the anti-siphon check valves that were installed BACKWARD at the factory from behind the walls and installed a brass check valve and anti-siphon valve at the flush connections. In the process discovered the city water connection exiting the water pump was loose and was flooding the storage bay. Not a happy camper. Fixed all the connections and currently monitoring all the connection for leakage. Can now flush tanks and hope for no more leaks. Frustrating for a brand new coach. Will contact Heartland Monday to let them know. Heading over to the neighbor that purchased the same unit to let him know what I discovered and how I addressed the issue.
