8) Refer to Service Manual and remove the dust buffer drive assembly.
9) Remove the 2 screws [1] in front securing the sub buffer unit.
10) Go to the back of the machine. Refer to "Removing the dust buffer unit" in Service Manual and open the controller PCB mount.
11) Remove the 2 screws [2] in rear securing the sub buffer unit [1].
12) Remove the 2 screws [1] on the side of the sub buffer unit [2] and then remove the sub buffer unit.
13) Flip the sub buffer unit. Remove the 3 E-rings [1] and then remove the sub buffer [2].
[Reference] Do not reuse the removed E-rings and prepare new ones.
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