EB tripped in AM mode after departing station due to intermittent door open Front M2 car B3 door. Re set EB - ok. Staff(TAP) checked, no abnormalities. Staff(CTH ) checked, no abnormalities. ~~~~~ 2529 EB tripped in AM mode after departing station due to intermittent B3 door open. Reset EB - ok. Staff(TAP) checked, no abnormalities. CE found 2529 B3 door operation ok. No intermittent door open when departing from station. Depot 2529 B3 train door operational check.  2529 B3 door checked/found both LHS & RHS door rollers worn/pitted/damaged. Replaced the rollers. Cleaned J-rail. Door cyclic check, door gauge check, door open/close timing - OK No DIR illuminated & all doors proven closed.  Sarma/Anand/Alan/Sugu/Kamarul 44956