As a customer, the level of service accepted by an individual is their choice.
If one wants an inspection carried out of the Styli from an experienced technician that is fine, if the assessment claims the Styli is Good for a extended usage, then the customer decides how they want their Cartridge returned, in a condition that will support an extended use, or while its on the Work Bench, supply a new styli with a full life ahead of it.
Obviously if the Styli is spent a suggestion of a further inspection of the Cartridges overall suggestion might be the inspection method proposed by the technician.
Again what ever decisions the customer is to make will be theirs only, as it is their money to be parted with.
What really matters is how much the technician knows about the Cartridge being inspected and how much the technicians assessment is trusted by the customer.
If the aim is to have a particular Cartridge produced through additional works undertaken, that will be a working model that is a accurate mimic of the supplied donor Cartridge, it seems to myself that it is quite important for the technician to be familiar with the New Version of the Donor Cartridge.
If the aim is to receive a returned Cartridge that is a functioning model with a long user life in front of it, then the workmanship of the technician, it seems to myself, that having a trust in the engineers work and selections of parts will be the important factor.
Foor the latter there are known services that can offer this with little concerns raised for the service to be received.
The former is looking most likely that the person with a full understanding of the Cartridge is a harder individual to find, especially with the knowledge of the Cartridge with a low hours nearly new model.
J Carr has made himself known as being a candidate that is with the capability to achieve this with the Lyra Brand Products.