TC reported 'B' side cabwas unable toopen. when TC was trying to do step out check. TC reported ' B' side cabwas unable to open. when TC was trying to do st ep out check. ~~~~~ 3551 TC reported 'B' side cab  was unable to open. when TC was trying to do step out check. CE: 3551 B/S cab door unable to open  Checked and found #3551 B side cab door top cable snapped. Changed out and function tested ok. DIR and DMI test ok. Done by: Sateesh/Rizman/Jack 12.5.24