Yes. As the Service Manager is asking you to do something which is not in the Service Information, they are effectively asking you for a quotation for a proposed instruction (under clause 61.2) which would change the Service Information.
As there is no rate for this, it cannot be assessed under clause 63.1 of the TSC, so would revert to clause 63.2.
As there is no rate for this, it cannot be assessed under clause 63.1 of the TSC, so would revert to clause 63.2.