TC reported obstacle detected at Front M1 car 'A1' door since BBT SB. Staff(CCK) checked and confirm ed no abnormalities. TC reported obstacle detected at Front M1 car 'A1' door since BBT SB. Staff(CCK) checked and confir ~~~~~ TC reported obstacle detected at Front M     Found #1627-A1 door LHS outer roller damage,replace both door with iron black roller done. Check door measurement,function test and static test all within carteria.During door function test observed #3627-B3 door obstacle detection and #2628-A1 door wobbling. OPS 20 raise to follow further check. Done by Rizman/Sanip. 04/01/4 #3627 B3 door obstacle detect and #2628 A1 door wobbling. To rectify. Found both cars roller damage.Replaced with iron black roller done.Done door test and measurement all within criteria. Door cyclic & static tested ok. Done by Sanip/Koh/Jack.  05/01/24