- MMS3 DIS008 energy sweep limited to maximum of 21 keV.
- MMS4 DES1 HV801 optocoupler failure has left the unit permanently disabled, as of 7 June 2018.
- MMS4 DES0 HV801 optocoupler failure allows the ESA to sweep the full range of energies at one extreme deflection angle, as of 16 July 2018.