TC reported air-con fault #2 set Rear M2car. Staff(BSH) checked, air-con fault #2 set Rear M2 car. Reset - ok. Car cooling. ~~~~~ 2606 TC reported A/C 2 fault. Staff(BSH) checked, A/C 2 faulty, Reset - ok. Car cooling. CE: T206-2606 both AC running. Temp 23.9*C . With Coolant Pressure 2 and Comp Unit 2-1 Fault.  2606 A/c 2-1 found freon pressure 0 bar.    CCU #2 set checked/found was new. Charged freon to test for any leak at CCU - OK. No leak was detected. #2 evaporator unit found emitting loud hissing sound by PM staff during A/c filter C/o. Further check/found freon leak at evaporator unit. M/O 11618633 raised for #2 evaporator unit C/o. Another M/O 11595064 was found raised by BSD for evaporator unit choke during PM on 14/02/2023. A/c 2 s/w put to O  positive. AMMC informed to assign train to BSD for evaporator C/o.  Irwan Masop/Au TK 44990