Passenger feedback to staff(WDL) that car 2522 near Front M2 'A4' door had unusual cracking sound. S taff(CBR) checked and confirmed no abnormality and no unusua l sound. Passenger feedback to staff(WDL) that car 2522 near ~~~~~ Passenger feedback to staff(WDL) that ca   Open Close speed pass: Yes FOD found: No Door cycle 20x: Yes Rubbing marks: No Do 10/20mm gauge test ok Check manifold and actuator for any air leak, none found. Door manual force check ok. Rectification Actions: #2522 found both main rollers damaged with pitting. Replace both rollers and function check ok. 10/20mm, door static test ok, door cyclic test ok. Done by: Saini, Din, Kumar (26/7/24)