3623 B1 DOOR UNABLE TO CLOSE (TRAIN PREP ~~~~~ 3623 B1 DOOR U BLE TO CLOSE (TRAIN PREP).  3623 ER D/L & found FC 926/920/936/933). TC cycled twice. Replaced door operator assembly. Checked door leaf inner rollers, J-rail, guide rail, door motor current, door gap (64.5mm) & weather strip condition - OK. No FOD found. Function check door operation & cyclic test - OK. Door open/close timing - OK. No DIR lit & all doors proven closed.  Sarma/Sugu/Shafie 45009 #3623 B1 door operator S/N : OLD : 1502W020011S004 NEW : 1602W020011S011