maintenance(keeping a machine or system in service) noun [UK: ˈmeɪn.tə.nəns] [US: ˈmeɪn.tə.nəns]The system is under maintenance. = El sistema está en mantenimiento.
upkeep(maintenance; the act or effort of keeping something in good repair) noun [UK: ˈʌpk.iːp] [US: ˈʌpˌkip]