Dell 2135cn Service Manual page 719

Chapter 3 Removal and Replacement Procedures (RRPs)
Replacement 38 SHIELD ASSY ESS (PL10.6.19)
1) Engage the two tabs of the SHIELD
ASSY ESS to the frame, and then attach
the SHIELD ASSY ESS to the printer.
2) Secure the SHIELD ASSY ESS to the
printer with the fourteen screws (silver,
6mm).
Go to the next replacement step:
Replacement 43 COVER REAR (PL10.1.5)
3 - 217
Version 
2008.02.01