I totally agree that maintenance of lawn is not something that we need to control as per 8.4 for a manufacturing company. But should be in the case of a golf course organization. However, maintenance services provider of production machines and equipment, I believe, fall in the statements under 8.4.1c where it specifies "The organization shall determine the controls to be applied to externally provided processes, products and services when: c) a process, or part of a process, is provided by an external provider as a result of a decision by the organization".
ISO/TS 9002:2016 in its 8.4.1 guidelines has the statement below:
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