Dell 2135cn Service Manual page 684

Chapter 3 Removal and Replacement Procedures (RRPs)
4) Secure the CHASSIS BREAKER to the
printer with the two screws (silver, tap,
8mm), secure the grounding terminal of
the HARN ASSY GFI GND to the printer
with the one screw (silver, with washer,
6mm).
Go to the next replacement step:
Replacement 21 PLATE ASSY DUCT (PL10.6.1)
3 - 182
Version 
2008.02.01