Home Guy wrote:
Oren wrote:

De-glaze the glass pane and replace it. Done!

Tony Hwang wrote:

Double pane? The seal is gone now whether hole is fixed or not.
R value near zero. Better replace the panel B4 weather gets
cold.

I didn't think it was necessary to speak to this aspect of the problem,
but some of you would rather bring that aspect up rather than address
the question directly.

The window in question is an Anderson window unit, about 25 years old.
I don't recall off-hand how the outside pane is mounted into the wood
surround, but the inner pane is mounted into an aluminum frame that
includes some sort of thin rubber/vinyl seal that presses against it's
side of the surround. There are thin clips mounted into this aluminum
frame that hold the inner pane in place. This is a double-pane window,
but it's not air tight (never was) but I guess it's reasonably
air-tight.
Hi,
As a mattter of fact, I am in Calgary. This afternoon my glazier came
and replaced 3 double pane panels which sprang a leak. Replacing 3
panels 5'x7'. two 2'x5', total time it took working inside, less than 2
hours. Cost was ~one grand, warranty is 10 years. Custom ordered Low E
Argon gas filled panel with mullion bars. Old ones were already fogging
up from the changing weather.