#515/516 Leak test fail 1bar/5Min Found ~~~~~ #515/516 Leak test fail 1bar/5Min Found     #3515 & #1515 Control reservoir (R) isolation cocks leaking at pipe joints.#3515 B13 double check v/v faulty,intermittent exhausting at brake frame silencer.#2516 PBSV faulty,continuous exhausting at brake frame silencer. #3515 B13 double check v/v c/o and brake cyclic test and leak test 0.59bar 5 min ok.#2516 PBSV c/o done.But air leak still remain the same.Further check found bogie 2 A/S parking brake was internal air leak and no 2 end Auto coupler bi-directional v/v air leak.Notification raise to RSW to follow up parking brake and auto coupler bi-directional v/v    c/o. #2516-PBSV Not:2223966 raise Not:2223970 raise for parking brake. Not:2223973 raise for auto coupler bi-directional v/v. Done by Sanip/Faddzal/Koh/Firdaus/Joshua. 27/11/20