Gst on warranty service on behalf of foreign company

Hello,

We import tools from company XYZ in Spain and sell them in India. Sometimes we need to repair some tools under warranty for free. However, we incur expenses which we need to be reimbursed for by company XYZ. In the Invoice that we need to raise to company XYZ to get reimbursed for the expenses, do we need to charge GST?

Am not sure if we are pure agents in this scenario or if the place of supply is considered outside India?

Thank you!