E320 Fuel Filler Cover Lock (Vacuum Actuated) Stuck!!!

[tdhenning]

I recently noticed my fuel filler cover stopped locking. The little pin that slips into the hole in the cover is stuck in the unlocked position. The vacuum actuator for that lock has been very noisy the last 3 months. Everytime I lock or unlock my doors I can here it from the inside or the outside very noticably. (Flump!!) I removed the interior panel in the trunk and I can see the actuator back there. Is there anyway to repair the actuator, or should I just go ahead and order a new one? Thanks for any help you can provide.