The flankers should remove easily. Simply slide towards the inside and lift sash straight up and pull bottom of sash out towards you over the top of the slider track and and frame. The best advice given so far is to contact your closest milgard dealer as the IG unit should be warranteed against seal failure. Let the dealers deal with it as that is their purpose in the chain of sales. If I'm not mistaked many have service riders or contract out to glazers for their warranty work. It's sometimes best to have a shop reglaze the new IG's as the glazing stop on some vinyl windows can be easily broken while de-glazing the glass, especially if its low end vinyl with single wall stop..Call your local dealer and check on IG's warranty first then proceed from there...Either way you go all you need to do is replace the IG, no reason to replace the entire flanker..