We recommend as part of operational maintenance that power supplies are replaced in matrices every 5 years. Our engineers advise this as good practise because:The MTBF (mean time before failure) of the PSU is 62,104 hours due to component lifespan of the PSU fan.It maintains the reliability of the system.It guarantees that your PSUs are in excellent condition for a further 5 years. Please contact ETL's sales team if you would like to do a standard Enigma or Vortex PSU refurbishment.Click here for more information regarding Enigma PSU refurbishments.Click here for more information regarding Vortex PSU refurbishments. Contact us