Condensate line remains impacted. Tenant reports prior system draining to wash basin in kitchen storage room. That line was connected to secondary pan of prior system, primary condensate line has likely been impacted for an extended period. Used vacuum and positive pressure to attempt drain flush but was unsuccessful at getting line to evacuate properly. Gravity line is original to building construction. Called service manager who recommended installation of condensate pump with copper line to bypass failed line as well as authorize substantial discount to installation. Discussed with property manager who wishes to discuss with property owner, property manager will likely seek second opinion. No further action necessary at this time.