Brother DCP-L8400CDN Service Manual page 507

(6) Turn the MP separation pad ASSY upright to remove it from the MP upper cover ASSY.
MP separation pad ASSY
Pin
(7) Remove the MP separation pad spring from the two Pins of MP upper cover ASSY.
MP separation pad spring
(8) After replacing the PF kit MP, reset the counter. (Refer to
(Function code 88)" in Chapter
Pin
6b
6a
Fig. 7-91
Pin
Fig. 7-92
5.)
7-50
MP upper cover ASSY
MP separation pad ASSY
Pin
MP upper cover ASSY
"1.3.37 Reset counters for parts
Confidential