Reported during train prep 3669 B2 door ~~~~~ 3669 Reported during train prep B2 door unable to open.  3669 reported 2 faults : 1) Obstacle detected 2) FC 3669 B2 door open operation timeout. Isolated interior release & DCP, door unable to open manually. Cycled door & found #3669 B2 unable to open with no fault shown. Use scope to check roller condition - OK. Door push/pull was smooth & no wobbling. DLS red line flushed with with surface for positive latching. DCS actuating plate distance - OK. Weather strip condition - OK. No FOD found. Door gap was within criteria. Measured DLD solenoid resistance 58 ohm - satis. Postulate DCP was faulty. Replaced DCP & preventively replaced DLD as well.  Celine Tan 45002 #3669 B2 DCP S/N : OLD : 1601WO20001S038 NEW : 1701Wo20031S024 #3669 DLD S/N : OLD : C151BDL194002 new : C151BDL157022