TC reported 'A' side wiper not working and water seepage from detrainment ramp. ~~~~~ 3549 A/S WIPER BLADE SHI  AND STUCK WITH WINDSCREEN USE WATER TO SPRAY AND CLEAN.WIPER A/S FUNCTION TEST OK.#3549 WATER SEEPAGE NOT FROM DETRAINMENT DOOR.FOUND CONDENSATION AAT CAB AHU UNIT AND WATER DRIPPING FROM AHU. CAB AHU FILTER VERY DIRTY C/O NEW FILTER.PURGE THE DRAIN PIPE AND CLEAN WATER FROM DRAIN PAN.CHECKED FOR CHOKE OK.AC ABLE TO CUT IN/OUT AND NO CONDENSATION.MONITOR MAINLINE.THERMITER SETTING OK.HAZIQ/RAGHU 22.03.2022