Inspect home for duct cleaning. Customers just purchased home about 2 weeks ago and are looking to have ducts cleaned due to a heavy amount of dust in home. Home built in 2013 and has original HVAC system. Inspect evap coil and drain pan. There is a drip in rear of air handler and coil over drain pan and a leak in the pvc behind the unit due to 2 45 degree joints not being glued or primered. Checked unit level and and drainage and with customer permission, repaired drain line and flushed system with nitrogen to ensure proper flow. Also set level to to drain towards main drain. Layed drop sheets where needed and cleaned 18 supplies and 3 returns. One return was cleaned at no charge due to it not having more than 2 feet of run. Removed filters, grills and vents and cleaned with spinning brush and microfiber cloth. Cleaned ducts with 3 to 5 passes each. Upstairs vents were not tied to studs so replaced them as is and held ducts through cleaning. Sprayed in hospital grade disinfectant sp