501/502-FW WFL UNIT INSTALLATION ~~~~~ 501/502 - FW WFL UNIT INSTALLATION.  3501/3502 both DT WFL assembly replaced - Done. Function test on 3502 cab - OK. But at cab 3501 when cock was normalised & cab occupied, WFL did not retract away from flange of the wheel.    Added/removed shims but fault still remained. OPS 20 raised to follow-up.  Ridzuan/Syukur/Suhairi/Abdillah 43900 TO FOLLOW UP.  3501 WFL magnetic v/v replaced & function test - OK. Cab occupied & checked A/s & B/s WFL able to contact the flange of the wheel. When cab was shutdown, WFL was able to retract from wheel.  Chan GF/Alan/Alcus 43912