Screen is underneath above the drawbar and held in with four bolts. It has the drain plug in the middle of it. Just infront of the screen are two bolts that have magnets on them so remove and clean these too.
You do not have to bleed the hydraulics.
If the hydraulics do not work, first check that you have the PTO in gear. If the lift does not work after standing the problem is most likely a stuck unload valve which will mean the hydraulics will have to be removed and serviced.