Pax feedback to Staff(SOM) train door #5did not open fully. Staff(NOV) checked and confirmed no abn ormalities. Staff(NOV) escorted the train for 3 stations. ~~~~~ 1601 Pax feedback to Staff(SOM) No.5 train door did not open fully. Staff(NOV) confirmed no abnormalities. Staff(NOV) escorted the train for 3 stations.  1601 A1 door replaced door locking device. Security/function checked - OK.  Lee PT 44866 #1601 Door Locking Device S/N : OLD : C151 BDL 145004 NEW : C151 CDL 16Y036