The workstations and servers are 2017 models -- Dell will not offer an extension of the warranty on systems that are now five years old.  
Dear Team, We have 47 Workstations Dell Precision 5820Tower and 2 Server Power edge E470 and 97 LED Touch screen model No Dell P2418HT. we are looking for warranty extension for above devices Regards Sonu Jain  Manager IT & Simulators  
Warranty Extension