Lexmark CX725
Remove the left cover. See Left cover removal.
Disconnect the motor cable (A).
Remove the two screws (B), and then remove the motor.
Lexmark CS/X72x and C/XC41xx: Print Quality Diagnosis ? Light Print on Printed Page Colors
Lexmark C/XC41xx and CS/X72x: 200.13 Paper Jam Error and/or Grinding Noise when Printing