TC reported TIMS showed obstacle detected at Rear M2 car 'A4' door whenever the door is opening. Fau lt self-cleared and did not recur at subsequent stations. St aff(CBR) checked and confirmed Rear M2 car 'A4' door opened ~~~~~ Check fault code,no fault code found.No FOD found.check roller Visually no abnormalties found.perform push-pull on door ok.to raise ops20 for further check on door opening slowly Ethan 30/05/2023  Follow up ops 10.Check timing door open/close for #2602 A4 ok.check roller bearings ok.check J-rail for any FOD ok.service and re-assemble and secure and function check ok.door cyclc test for 20 times ok.side finding found #2602 A2 door juddering.further check found L/H side roller delaminated.C/O done.door cyclic test for 20 times ok.10/20mm check at #2602 A2 and A4 done ok Leong / Shahrie 45076