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Rich,
The glass us easily removed with an osclating multitool (see youtube for tips on window removal with one of these). We previously used a utility knife and it took ages.
The black silaflex sealant cut in seconds and the glass came out.
Swapped the dual pane – sealing it in with new sikaflex.
Cleaned up the sika bead and any mess – job done.
We installed new panes of temperrd glass.