TC reported irregularities opening traindoor at car rear M2 "B2" door. Staff NEW checked and feedba ck car rear M2 "B2" door did not open at NEW SB, NOV SB and TAP SB. ~~~~~ 2604 TC reported irregularities opening train door at B2 door. Staff NEW feedback B2 door did not open at NEW SB, NOV SB and TAP SB.  FC DOM(Door open inmotion). Found 2604  B2 door roller LHS delaminated. Replaced roller & function check door opening & closing - OK. No abnormalities found. Door static test - OK. J & guide rail cleaned & weather strip in good condition. Lee PT/Anand/Sugu 45187