Have a look on the bottom of the machine. I'm pretty sure there is a way to access the innards from down under.
Also, look at the diagram at the bottom of page 3 of the user guide. The unmarked circles are where there are screws; they are most likely covered with plastic caps that are easily removed using a small flat-head screw driver. If there is no access from beneath, then try removing the panel where the hand wheel is. As a last resort, the rear panel may need to be removed.
Undoubtedly, there will be awkward clips holding everything together. Gentle prising with an old credit card may help with levering the panels apart.