I may have found the source ... a couple years ago I replaced the oil level sensor and lower pan gasket at the same time ... did everything right and torqued the pan bolts per the service manual ... I never checked the torque after that until today ... I found several pan bolts that took a slight turn before clicking and most are in the location of my slow leak, right near the AC compressor ....
I will run the car a few times and recheck the torque again and look for evidence of my slow leak ...
Could this have been the source?