Reese if u pull the sensors and they still leak............
I have a local tire shop that still uses the big round galvanized pool they put mounted tires underwater in to find leaks. They have a hydraulic ram with fingers that push it under and hold it. I bet there r also local tire shops in your neighborhood who have them. Call around find a place and put the tires in the dip tank u will for sure get to the bottom of it.