37 Consulting in the field of maintenance and repair of telecommunications network hardware, apparatus, and instruments; Contractor services, namely, review of and remedial recommendations for building plumbing, electrical and mechanical systems for others; Installation of electrical and generating machinery; Installation, maintenance and repair of computer servers; Maintenance, repair, replacement and tuning of components, parts or systems in steam and gas turbine generators; Providing information related to the installation, maintenance and repair of electrical systems, appliances, windows; Providing information relating to the repair or maintenance of loading-unloading machines and apparatus; Provision of information relating to the repair or maintenance of measuring and testing machines; Safe maintenance and repair