If you haven't already tried it take the forend off and see if that helps. Do you store the gun fired or cocked?
If the linkage from the top lever to the locking bolt is broken you won't get the gun open without taking the butt stock off to manually retract it away from the barrel lug. If you store it in the fired position its possible something else might have broken. I had an old P grade crack a mainspring plunger once and from there the gun wouldn't open fully because it was fighting to cock the hammer.
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