Upon arrival inspected 2nd floor furnace. Follow up to check if furnace has gas leak. Opened gas valve that was left in the off position. Checked all gas joints with gas leak solutions. No leak. Not smelling anything @ unit. Check all other gas line in mechanical room. 1st floor furnace gas lines. HWH gas line and Main gas line that’s distributing gas to all appliances. Unable to confirm any gas leak or smell @ this time. Office will follow up customer to schedule extensive diagnostics with plumber/tech Gas is left off @ emergency shut off. Follow up is needed View visual findings from this job here - https://visionshare.xoi.io/?id=XA-FA02-CE59A9E8FE854D3F9F3F8EEAEC2CF877