My first duty weapon was a 686. I purchased a 586, four inch barrel last year and have enjoyed shooting it recently.
I wonder if the fire was hot enough to change or weaken the metalury used in the forging process. Anyway I would clean it up and restore it as best or have it professionally done. I have no idea who might do so or how much it would cost.
I'm sure it's priceless to you as anything my dad had.
Best wishes.
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