Repairing a milwaukee grease gun that will not pump under pressure.

This milwaukee grease gun is running fine and pumping grease when under no load, but customer says it fails to pump when it is under any pressure.
gun was dismantled, cleaned out and check over for damage.
one of 2 possible causes. the check valve was jammed open before cleaned or the grease carriage used is not compatible with the gun. and these milwaukee guns do not work correctly with all carriages.
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