Good luck with the Nitrogen, it did not find the condensor leak on mine, nor did the vac test.
Wrong I know, but I used compressed air to find leaks in mine many years back. Replaced condenser & dryer after which it was great for 3-4 years. Then got the slow leak problem. Eventually traced to the spindle seal on the compressor, which I only found while replacing the mag clutch. UV dye definitely makes it easier.
 
So, if your going to pull the whole unit off anyway.. You can have the Cv head pressed out and save the unit then👍
 

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