Staff(RFP) feedback that car 3608 'B4' door did not open at platform. Staff(BDL ) confirmed car 3608'B4' door did not open at BDL station. ~~~~~ 3608 Staff(RFP) feedback B4 door did not open at platform. Staff(BDL ) confirmed B4 door did not open at BDL station.  3608 B4 door leaf roller (R/H/S)- worn  - Replaced. Door function checked -OK.Door gap 63.5mm. Door cyclic checked - OK. Door open/closing timing - OK. No DIR lited. All doors proven close. No FC found. TIMS Door static timing test - passed. Cleaned J-Rail, guide rail. Sugu/Sarma/Anand/Alan/Kamarul 44953