The RCA job description from publication 181....Dated 2007..
Variable Work Hours
As an RCA, you will replace a regular rural carrier on his or her scheduled day off (primarily Saturday), on vacation, or on other leave. Work hours will vary depending on the office and route to which you are assigned. You must be willing to work weekends and some holidays and be available for on-call employment. You may be assigned to other carriers' routes, increasing the number of hours you work.
Not sure if this overrides the 2002 settlement since it's a later date of RCA job descriptions.