Issue with Nissan Murano AC

I''m reaching out with a bit of a car trouble that I''m hoping someone might have some insight on. I''ve got a Nissan Murano, and lately, I''ve been having some issues with the AC.
About 22 months ago (around two years), I had to change the compressor because the AC wasn''t working at all. That seemed to fix the problem, but now I''m running into the same issue again. It''s just not cooling and blowing hot air.
I tried refilling the gas in the AC system, and initially, it seemed to work fine for about two days. However, after that, it went right back to blowing hot air. It looks like there might be a leakage issue somewhere in the system because upon checking, I found that there''s no gas left in it now.
When I had the gas refilled, the mechanic used some colored chemical to check for leaks, but unfortunately, it seems that wasn''t sufficient. He mentioned that he doesn''t have the proper equipment, such as laser-based glasses, to thoroughly inspect for leaks.
Now the mechanic I consulted mentioned something about a possible problem with the Talajat/condenser and suggested taking it to Shuwaik for a closer look.
I''m a confused on what to do next. Any suggestions or advice would be greatly appreciated, as climate is changing so getting difficult to drive day by day! Thanks in advance for your help.