Hello everyone, sorry for bothering all of you about this.

Me and my friend buy and sell things on EBay and we recently sold a digital camera online. It arrived to the buyer's address on August 2nd and today we got a message saying that there was a plastic piece thing whatever that shows up in photos and the buyer decided to take it to a local camera shop to get it repaired and it was $45 and they are asking that be credited back to them.

How should I proceed? I've sent a message asking for a copy of the receipt and I am awaiting their answer.