Dell 2135cn Service Manual page 721

Chapter 3 Removal and Replacement Procedures (RRPs)
Replacement 40 COVER SIDE L LOW (PL10.1.9)
1) Attach the COVER SIDE L LOW to the
printer.
2) Secure the COVER SIDE L LOW to the
printer with the two screws (silver, tap,
8mm).
Go to the next replacement step:
Replacement 43 COVER REAR (PL10.1.5)
3 - 219
Version 
2008.02.01