Dual-pane windows: replace or repair?

Homeowner seeks cheap fix for leaky cells

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Q: I’ve read your recent column about windows and have some related questions.

I have dual-pane windows whose cells have "leaked" and the inside surfaces are discolored. They are installed in traditional wood frames and are easy to remove. They have a metal/plastic composite spacer frame at the edge, sealed with some sort of black mastic. I have a number of cells that were replaced under warranty when water leaked inside and would like to see if I can rehab them.