Bull's Eye Pattern

This is the Bull's Eye pattern typical of a broken window seal in a double pane window.  As the Argon gas dissipates, pressure increases inside the window the panes are pulled together.  These are actually touching!  Andersen had problems with windows manufactured between 1989 - 1993.  They agreed to fix this window, and hundreds of thousands of other ones.  They did so by drilling a hole into the top of the sash, relieving the pressure, re-inserting Argon gas and filling the hole with caulking.  The repair works perfectly.