Dispatched to investigate water damage on a ceiling. Upon arrival system was turned off. I advised Michael to turn system on to see where it was leaking. I poured 2 gallons of water down drain and did not see any spot in the PVC that was breached. Documented the secondary pan underneath the evaporator coil. It is in real bad shape. Possible leaking through secondary pan. I installed a quick blast and use nitrogen to verify the primary drain line is clear. I am recommending a new secondary pan.