async loadMaintenanceList(userID) {
        let maintenanceList = await R.findAll("maintenance", " ORDER BY end_date DESC, title", [

        ]);

        for (let maintenance of maintenanceList) {
            this.maintenanceList[maintenance.id] = maintenance;
            maintenance.run(this);
        }
    }
Load maintenance list and run
@param {any} userID Unused
@returns {Promise<void>}