The passenger sliding door (manual not automatic) will not unlock or open. I cannot pull the lock up manually and the outside door handle moves freely and so does the inside one. I removed the door panel inside the car and tried to push the linkage that unlocks the car manually, no luck. I think the culprit is the locking mechanism the linkage attaches to. I cannot seen to figure out how to remove this part. Any insight would be appreciated. Any other reason why I would not be able to open the door manually?? HELP! FYI - the power door locks operate fine on all the rest of doors. Thanks, Dennis