Hi Rigga! Many thanks for the information.
I am sometimes confused by different ideas on this subject, coming from colleagues with larger experience than mine. It is definitely a complex field, and EASA rules do not look "clear" enough to my untrained eye.
In addition, I believe the operator needs sometimes to be educated on this issue.
However, I got complaint from some of them, and this can lead them to use other shops. So it is a very tough balance to handle a customer to be happy, and avoid to mess up in an audit from the authority. Of course, no one wants to pay a complete overhaul "just because TSO is missing....".
Again, many thanks.