Passenger feedback to station staff (YIS) that there was air-con condensation at rear DT car. Staff( AMK) checked and confirmed there was slight air-con condensa tion near the rear partition door at the rear DT car. ~~~~~ Passenger feedback to station staff (YIS     During 3-weekly check,replace #3665-a/c 1 end filter and purge drain pipes. Done by Shamir/Zul/Faiz.  10/05/21