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Window repairs investigation

We are selling our house and need a quote and possible repairs done to one window in our house that the inspector had classed as high water readings. All others have come as fine. This is a bay window in a bedroom and need it too at least be looked at as soon as possible. May have rotten wood but unsure. The water reading at the bottom of the window also read as dry so please help us investigate and see what the issue is and realitive costs to fix, repair or replace.