EMU 521/522 Air leak test failed 1.0 Bar ~~~~~ 521/522 Air leak test failed 1.0 Bar/5 min (DT check).
 3521 & 3522 both pipe line fitter found leaks.
Replaced pipe line fitter for #3521 horn, #3522 water tank, horn & A/S wiper.
Function test OK except for #3522 water tank bottom plug leak & isolated.
#2522 brake frame silencer still leak (suspect check v/v faulty).
Air leak test still failed at 1.4 bar/5 min.
OPS 20 raised to follow-up.  Selvan/Lee PT 03/12/2020 To follow up.