have a leaky window on one of the side windows above the nav table. looks like it was assembled with butyl tape and now the tape is not holding the plastic material of the window. you can push on it and it comes away from the aluminum framework. hoping someone can tell me how to deal with this problem. on the inside frame, there are a series of Philips head screws all around the frame. what exactly do these screws do? hope someone has already tackled this job and give me a little help in how to approach it. Thank you in advance...