Buyer asking for money after completion, am I liable?

Hi all! I sold my flat which completed last week.

The buyer had 3 viewings but didn't have one right before exchange. They also didn't get a survey.

When we left the flat on completion day everything was working perfectly including the dishwasher, oven and fridge.

They're now claiming that all 3 of those things are broken and they want money to have them removed and replaced. They have asked their solicitor to ask my solicitor for this.

As mentioned, everything was working when I left so l'm not sure where I stand? Their complaints seem to be more about a tiny bit of burn in the bottom of the oven and a cracked freezer drawer.

The property was 9 years old.

Any help would be great! Am I liable?