Removing Kyocera FS400 case

I have an old Kyocera FS400 which has stopped ejecting printed pages
(the rollers don't turn, though something can be heard to operate).

Easy enough to remove the lower case, circuit board, etc., but the top
case which covers the paper path doesn't seem to have any obvious
fasteners of any kind.

Can anyone enlighten me as to the correct removal technique?

--
moulin/.SIGNATURE