SNAPREP: 1647 Door issue, Half of the do ~~~~~ S PREP: 1647 Door issue, Half of the do     #1647-A1 door found rubbing sound.Suspect roller or J-rail issue.Non platform side,to follow up with 0020 all doors able to open & close. Checked by Gopal.  18/05/21 To check 1647/A1 door due to rubbing Checked door post weather strip of #1647-A1 door,weather strips are intact,not causing any obstruction to door operation.Checked J-rail and door guide rail,no F.O.D. found.Carried out door pull/push test-8kgf.Found #1647-A1 ddor RHS rollers with knocking sound during door operation.To raise 0030 to replace #1647-A1 door RHS main rollers. Checked by Joshua.  20/05/21 1647/A1 RHS door rollers faulty. To c/o #1647-A1 RHS door roller replaced.Mating strip T-63.3,M-65.6 B-64.3. Push/Pull RHS-4.6 kgf,LHS-4.8kgf,PSS ok,DLS ok.Door cycle 10 times ok.Door open/close timing ok. Done by Koh/Din. 20/05/21