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This is a common problem and Volvo suggest the follow procedure. Not an expensive fix.
Once the lock is defrosted and is moving freely again, slightly lift the claw to open a passage towards the pawl bearing area. Use lubricant (PN(###) ###-#### with a nozzle pipe attached. Insert the nozzle pipe into the passage and aim upward towards the pawl bearing area. Spray for a few seconds.
The only factory picture i have , has a copy right and will not allow me to copy or send it unfortunately. But if you open the door and look at the latch area you will see two screws at the top and one at the bottom. Insert the nozzle in a upward direction between the two screws and that is the area to spray.
Since this is a common issue, and volvo has suggested the spray to correct the problem, i would only use what they are suggesting.
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