When the aircraft has no electrical / hydraulic power available due to maintenance, it is still possible to move the leading edge flaps and slats fully up or down. This could be necessary for slat-adjustments or when the engine t/r’s have to be opened.
All you need is an external (hand)pump filled with hydraulic fluid and 2 hoses.
The pictures show you how to connect the external pump on which connection in the wing-root.
These connections are found under panel 511 AT (LH wing) and 611 AT (RH wing).
(For 737 Classic, see similar item in this category)