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According to the Amazon listing that thing is about 8 kilos so I'm guessing it's a wire wound step down transformer inside rather than a switch mode type supply.
Any normal sparky should be able to bench test it to figure out what the fault is and transformers can be rewound if necessary but it's a job for a company that's geared up to do that kinda thing. Maybe a motor rewinder could do transformer repairs, it's fairly similar work although it's doubtful they'd have machinery so they'd probably have to do it by hand.
As for why it went faulty in the first place...you'll get a much better idea of that if you get someone to bench test it and know what the actual fault is. It might be as simple as an internal cooling fan that's no longer working or damage by chronic marginal overload but, not having seen the inside, this is guesswork.
Any normal sparky should be able to bench test it to figure out what the fault is and transformers can be rewound if necessary but it's a job for a company that's geared up to do that kinda thing. Maybe a motor rewinder could do transformer repairs, it's fairly similar work although it's doubtful they'd have machinery so they'd probably have to do it by hand.
As for why it went faulty in the first place...you'll get a much better idea of that if you get someone to bench test it and know what the actual fault is. It might be as simple as an internal cooling fan that's no longer working or damage by chronic marginal overload but, not having seen the inside, this is guesswork.
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