Performed QA on Trane Gas Furnace/Heat Pump system. Reviewed installation with homeowner and reviewed with her how the heat pump/Furnace system operates. Tested system in cooling mode and tested in heating mode. Performed combustion testing and measured gas pressures. Tested wet switch and ez trap safeties. Filled condensation pump to test. Homeowner mentioned she overheard the installers talking about spilling something and needing to take pictures. She was worried that something happened to the system. Did not find any issues or any indication that something was spilled. Completed checklist form in system.