I guess since you have replaced the rear bathroom window in your Vista, my question is if you can recall where you found the leak to be directly? Since there could be one or more points of entry and considering that this has been a common problem with this model. This window has been removed, resealed and reinstalled shortly after the originals owners bought it. It leaked with the second and third owners even after resealing. It continues to leak and I am the fourth owner. All the work to fix the leak has been done at RV dealerships. Amazing. Just wondered if you had any information to share with your repair on your window?