Sold faulty iPhone - buyer asking for passcode?

Hello! I sold an old iPhone to someone in the EU (listed as UK only and set my buyer requirements to domestic postage but didn’t change my buyer requirements 😤). I originally sent it to Mazuma when it was working so I know you have to log out of iCloud etc before you do. I didn’t accept their offer and got it back and it has been sitting in my house for months. When I had a clear out, it wouldn’t switch on so I listed it on eBay for parts. The person who has bought it has now asked for the passcode (I assume they have it working). My question is if I can’t remember this do I have to send this to them if I listed the item as faulty? I worry about them being able to access other things on my old phone also if I give them any codes/pins. I am also unsure how Mazuma accessed the phone also if it had a passcode. Thanks in advance.
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If you sold it for spares or repair and the buyer has now got it fixed you are in a awkward position. 

 

In order to complete the repair he needs to have full access and this would have been his expectation when he purchased. 

 

The fact the phone may contain sensitive info is something you should have considered before listing. 

 

You cannot reasonably expect the buyer to return a working phone to you without some payment to him for his time and any parts cost