Welcome to the forum, Byron!
When you cleaned and inspected, did you check the right hammer and sear engagement? Enough crud buildup could allow the right hammer to stay cocked (barely) , but with insufficient engagement, which would allow the hammer to slip off the sear when the left barrel is fired first.
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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