Epson Progression U12 - Manual (Page 65)

3. Open the clasps holding the power supply and drive cables to
the side of the subassembly, as shown below. Then remove
all the cables from the clasps. (Do not disconnect any cables
from the main system board.)
4. Grasp the back of the subassembly by the edge on its upper
left side, as shown below, and lift up the back end.
2-8 Accessing Internal Components