This, by far, was the craziest thing I've ever worked on.
Ok, so more dye was put in the system. Went back the next day to find the evap full of dye. Perfect, the evap is shot. Just before I'm about to condemn it, something tells me to check around a little more - why is there dye on the floor of the freezer? And maybe I've been watching CSI too much, because I see - a spray pattern on the evap?
Pump 'er down again, ramp the nitrogen to 300#. All the sudden PSSSSSSS - out of a braze joint right by the solenoid that runs behind the evap - spraying a pretty picture. Drop the pressure to 200 and literally NOTHING. Spray soap shows tiny bubbles. Ramp it back up to 300, blows the soap off the joint. I've never seen anything like this in all my years.
Rebraze joint, vac and recharge - returned two days to a full sight glass.
Perplexing, for sure.