TC reported train door at Rear DT car 'B3' slow in closing. Staff(ORC) checked and confirmed train d oor 'B3' door slow in opening and closing. ~~~~~ TC reported train door at Rear DT car 'B   #3606 B3 Door FC 960, 966: B3 door com fault/ error 6 Open Close speed pass: Yes FOD found: No Door cycle 20x: Yes Rubbing marks: No Door Push/Pull force: 7.8kg Door mating gap: 64.7mm Door Lock Switch red line when door closed, ok. Door Lock Switch Cushion Rubber intact: Yes Door Close Switch distance from actuating plate: 14.4mm Door Wobble: No Rectification Actions: Door operation check found no abnormalities. DLD    and DSS checks ok. Replaced door operator due to previous fault history. Door function test, cylic test ok. Static timing test satis. Notification to CSC: 2585836 Done by: Rizman, Jack, Sanip (4/4/24)