188.8.131.52 clause b
Basically, monitoring and measuring resources shall be maintained. An then it says you need to maintain documented information that shows the monitoring resources are fit for use.
Preventive action is required but you’d have to show that failure to take preventive action would likely (see risk assessment) result in customer dissatisfaction, failure to fulfill objectives (aka ineffectiveness) or nonconformity.
Auditors though may be slow to recognize this so you may get away with no preventive maintenance unless equipment failure was stopping your organization from fulfilling a contract.
7.1.3 provide and MAINTAIN infrastructure.I am not looking for whether its "good" to have one but rather if it is required.