Dell 2135cn Service Manual page 655

Chapter 3 Removal and Replacement Procedures (RRPs)
3) Fix the left shaft of the ACTUATOR
REGI IN with the hook of the CHUTE UP
to attach the ACTUATOR REGI IN.
Check the ACTUATOR REGI IN movement, after the procedure 3 is completed.
Go to the next replacement step:
Replacement 8 ROLL ASSY REGI (PL3.2.9)
3 - 153
Version 
2008.02.01