this my experience last year,

aircond no cold air bring to aircond specialist, check and evaporator bocor so change that but the guy say if after few days not cold air then compressor but after few days really cold so in the end have to change compressor

well the guy told me he can change it one shot but he also not sure about the compressor as evaporator leaked..if told me change all like tipu me so he just fix whats broken first and and see how it goes

working fine since then until today