If the leaks are from between the port frames and the cabin sides you can take them off, clean all the old bedding compound off, clean, rebed and reinstall. THat's the only way to cure leaky ports. Now, if the frames or glazing are broken replace the ports. If there is any soft and/or wet wood in the cabin side trim or the backing framing you should replace it. None of this work is difficult, more of a pain. If the ports are fixed plexiglass be extremely careful when removing as they will snap like a dry twig if you put too much stress on them (like I did)and replacment is not a cheap date. Start be using a sharp blade to cut a small strip, then lift and cut, lift and cut all the way around. Have fun
