7.  Remove the bracket wrench [A] of the upper paper feed unit (
  x 2). 
 
8.  Release the relay harness [A] of the lower paper feed unit, and then insert the relay 
harness into the notch [B] of the upper paper feed unit (
  x 1). 
 
9.  Release the relay harness [A] of the upper paper feed unit, and then connect the relay 
harness to the bottom connector [B] (
  x 1).