Upon arrival system was cooling fine. I did a thorough inspection of unit. I came across tape coming off supply plenum. I regaled those sections. I did not see no water in float switch. I did see microbial growth in drain line. I checked pressures and delta and everything was looking good. I also went ahead and flushed drain line with vacuum and water hose. Pulled out a lot of gunk. I also sprayed down condenser coil with water hose. I did come across and double trap and stack was needed to be higher than primary line. I informed customer if he has issue with drain line we will need to remove the double trap. Customer paid $189 for drain line treatment with card.