1714 Reported during train prep brake test failed. ~~~~~ 1714 Reported during train prep brake test failed.  3713 Self Test on Brake failed. Download ER & EP2002. #1714 found Rio Valve#2 faulty. BCP 1,2 & 3 low brake pressure. Performed Preparation Test (NG). Replaced Rio Valve. Brake cyclic test ok. BCP measured ok.  Shafie/Alan/Lee PT/Kamarul/Sarma 45459 #1714 #2E RIO V/v S/N : OLD : 1733051SPC NEW : 1650006SPC