What the guarantee covers
Two things are guaranteed for ninety calendar days: the component installed, and the workmanship of installing it. The period runs from the date printed on your invoice.
Tell us in writing that one of the two has failed inside that period and an inspection is arranged. Should the claim pass inspection, the choice of remedy rests with us — redoing the job, supplying a replacement component, or returning what was paid, for the service and for the part alike.