TC suspected FDT car 'A1' door did not opened when all train doors were opened.SM(ORC) checked andconfirmed the no abnormalities.Staff (TAP) checked and fe edback that 'A1' door at FDT car were slightly slow in closi ~~~~~ TC suspected FDT car 'A1' door did not o     #3606-A1 door fault code 026(multiple times)Found A1 door RHS main roller damage.Replace roller done.Check & service guide rail ok.J-rail ok.Push/pull ok check PLS red mark ok,DLD rubber cushion ok.DCS to plate ok.Conduct door cyclic test ok,Door static passed. Done by Saini/Firdaus.  05/05/23