TC reported of a loud hissing noise emitted from 'A' side wiper. TC confirmed MR pressure was at 8.2bar and there was no compressor fault. Thereafter, TC updat ed that MR had charged up to 9.2 bar. TC reported of a loud ~~~~~ TC reported of a loud hissing noise emit     Check and replaced test point on #3512-A/S air leak check ok.Check both DT car MR pressure ,air compressor charging time and cut in/out all ok. Done by Saini. 04/01/23