2004 VZ Commodore Air Conditioning Evaporator O ring leaks under the dash

[winter2008]

004 vz commodore sedan, Air conditioning re- gassed but cooling and was blowing warm air. I checked for leaks at home with dishwasher liquid into water and pour the water on TX valve and found the leaks
When I changed the TX valve O ring but air is still coming out. Is it evaporator, O ring or the pip has hold on it under the dash. Any help is greatly appreciated. Thank you
video link https://www.youtube.com/watch?v=N1JQ0Zint80