I have been in contact with Balazs from CNCDrive and unfortunately it seems it won't be covered...

No, this kind of problem is not covered by warranty, because the transistor can be damaged only with overstressing the output e.g. with misconnecting the output, e.g. connecting a low resistance like a direct connection to the +24Volts.
Or if the issue is something else like a soldering error then we repair in warranty for 12months from purchase (shipping) date.

I haven't asked for a cost of repair but I did ask for the data sheet for the mosfet....

The transistor this one: https://www.digikey.com/products/en?keywords=NTR5198NL
It is not hard to remove and replace this kind of component, I mean it looks harder than it actually is.
You just need a tweezers and a soldering iron.

I haven't had chance to try another output as the charge pump yet but I'll try later. The Relay switches on and off fine when I connect it up to 24v.

I will also check the voltages as suggested but my local electronics shop may still be cheaper than shipping to Hungary and back. I am wondering though what could of caused it and will it happen again

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