Performed QA on Trane Heat Pump/Air Handler installation. Reviewed installation with homeowner. She had questions about using the Schedule feature on the thermostat. Went through with her how to setup the schedule. Also reviewed with her how the heat pump operates and when to switch it over to the oil boiler in the winter. There old system was a straight AC. Tested wet switch and ez trap safeties. Did not find any signs of water in the drain pan. While testing system, found a lot of Oil around the suction line under the insulation. I soap tested the Lineset connections and did not see any leaks. Refrigerant charge was good as well. This could have been oil from during the install. Also there are only 2 Wires going to the outdoor unit. If there is ever a communication issue we will need to try to run a new thermostat wire to the outdoor unit. Both of these things are for us to monitor, no follow up is needed.