Water leak from the upstairs unit. Found the source of the leak to be from a poorly connected section of PVC. (See pictures) Removed and rebuilt the beginning section of the drain line, including the clean out and P trap. Confirmed fall for proper drainage. (Also see pictures) Repairs needed: The indoor unit needs to be removed/uninstalled, to address the wet decking and wet insulation under the decking. The emergency pan is showing rust from the water collecting outside of the pan. When the unit is reinstalled, the pan needs to be pulled forward and to the left to be under the drain line, so the pan can catch the water in case of a breakage or backup in the future. Recommend primary and secondary drain outlets to be protected with overflow protection switches.