Petrol cap lever is stuck in Mk2

Hi
Inside my MK2 there is the middle compartment between the seats, where you can find the levers for the boot and petrol cap. However the petrol lever has become stuck, it does not move at all. I can open the cap by going into the boot and releasing it manually. However i need to get this problem solved. Has anyone got any advice or is this one for a mechanic?
Cheers
Dave
Inside my MK2 there is the middle compartment between the seats, where you can find the levers for the boot and petrol cap. However the petrol lever has become stuck, it does not move at all. I can open the cap by going into the boot and releasing it manually. However i need to get this problem solved. Has anyone got any advice or is this one for a mechanic?
Cheers
Dave