I own a 2020 Ram 2500 HD 6.4 with a rear coolant leak. It's was pressure tested last weak and I was told it was fine, however I had to put almost a gallon of antifreeze in it every day for the last 4 days. I took it back and they put it on the lift and pressure tested it again and it poured out antifreeze where the engine and transmission meet. I was told the manifold needs to come off in order to find the exact leak.. So I ask is this necessary??