I had a slow leak that passed pressure testing like 4 times.

All usual suspects of o-rings, coolant pipes, six rads, etc visually checked out fine.

After keeping the skid plates off and driving it, dealer found the leak ended up being some small plastic piece down by the PCM (think under the steering wheel near the firewall).

my leak dropped my reservoir tank about 1” a week. So in about 2-3 months the tank would be empty. That type of leak even passes “pressure testing”

 

Thanks to you and others suggesting O-rings and connections at the culprit. In my case it's even slower - it takes more than 6 months for the tank to get low. Sigh, tracking this down is going to be a royal PITA.