Rainer is correct.
on the 83 maramu the slider rails are both glued and finish nailed to the facing which is 8 mm veneered ply. Dont try to remove the rails or you will deface the laminate.....
on the 83 as rainer stated there are small rubber hose in the slot of the runner. You must remove the rubber hose then carefully lift the sliding door out. then there are 2 screws on the back of the sliding door to remove the handle.
best of luck.
Ask me how I know.. I learned the hard way..