I sold it via eBay (personal seller btw not a business)
Some weeks later I get the message from ebay to say I have to do a return and I recieve back the 690 absolutely cooked and not working and ebay take back the 300 odd quid.
It was actually outside of the normal return window too and I never have returns enabled so I dont even know how they managed to push that through.
Was a long time ago now so cant fully remember all of the specifics, only that it was a life lesson and I never did do any "high" value ebay sales again.