Replacement Device under Limited Warranty

This is a question only an Apple Store or authorised service centre can answer, not this community of product users like yourself. Take it to one of these places for inspection.

Be aware that a refurbished unit has had intense scrutiny from qualified Apple technicians and has had more attention and service than a unit sealed in a box at the factory. It should not be assumed that they are inferior to factory-fresh products. Apple in fact sells refurbished units, albeit at a reduced price.