TM 10-3930-669-20 (3) Clean  outside  of  seal  with  mild  soap  and water. (4) Replace all damaged parts. c. Installation.  Starting at bottom center of door, install cab door seal (1) on cab (2). NOTE Follow-on Maintenance: · Install step plate (Para 15-6). · Close cab door (TM 10-3930-669-10). · Remove   wheel   chocks   (TM   10-3930-669- 10). END OF TASK 15-31