Umarex M1A1 Repairs

My trigger and safety no longer functioning. Anyone know how to get access to the trigger mechanism once you break the rifle down. Only see the plunger/metal assembly on top, see no way to remove it even after taking out screws. Is it pressed in? Anyone have a schematic diagram.
This may be what you're looking for-

Legends_M1A1_Diagram_1.jpg
 
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