Upon arrival found upflow system retaining water due to a clogged/restricted primary drain line. Primary condensate drain doesn’t have a p-trap assembly. Secondary condensation drain port has SS2 float switch that is loose and not tightened down flush to prevent water leakage. Underside of upflow evaporator coil clean. All electrical components are functioning properly. Refrigerant charge within manufacturer specifications. I was instructed / authorized to perform clearing of the drain line with just nitrogen. System currently functioning again at this time.