DIY HACK: What glazing firms don't want you to know
Window Replacement and Glazing Firms continuously state you cannot repair sealed units when they fail with condensation. The key reason is they want to sell you new windows. These units can be repaired, There is a simple process and there is a kit available that provides what you need.
A repair takes 20 minutes to complete and all you need to provide is a standard drill and some tap water.