Upon arrival system was on in cool and thermostat was satisfied at 72 I asked homeowner for filters to replace and container of bleach Homeowner stated that he is comfortable changing out his own filters but provided me with bleach to test drain line I lowered thermostat to keep unit operational during the maintenance and went into attic Upon arrival into attic I checked deltas and had 18° of cooling I then checked the electrical connections and made sure they were all secure I then checked blower motor and fins Fins did have some buildup on it but motor was in good condition I then checked Evaporator coil which also has some buildup on it but was still in good condition Lastly I checked drain line, but before pouring anything down I noticed drain pan was rusted up. I started with pouring some bleach down the line then I chased with water I got to about 1 gallons down the line and when I started to pour the second I started having water come out of the secondary. I then waited for