SUPPLY OF GOODS UNDER WARRANTY/AFTER SALES SERVICE

Hello Expert,

Plz quide us for the following matter:

If I am a manufacturer and I m supplying goods to customer which also covered under one year warranty period.and during warranty period any services or consumables require then I m liable to provide such services and replace such parts without any cost.bcoz I have already charged consideration at the time of sales and it is specifically mentioned in sales invoices that such goods are covered a one year warranty.

in the above issue, How can I supply such parts to our customer?