TC reported car 3504 'A3' door was not proven closed. TC recycled doors once to clear fault. ~~~~~ TC reported car 3504 'A3' door was not p     Check and found door accumulate alot of grease and dirt in J rail and carbody frame.Clean up ok.No FOD found on guide rail.Roller found no wobbling,door cyclic ok.Door static test ok.Door gauge test 10/20mm pass.To do short loop and monitoring. Done by Sanip/Faddzal. 07/06/21