Hi Leon,
What I'd do first....
On the issue of the fuse: are you sure you have the correct type (fast or slow blow) and current / voltage rating as the fuse specified for the device. Post a high resolution photo of the fuse markings imprinted on the fuse itself and also of the fuse label inside the box. Do you have an electrician friend that could measure the current drawn at turn on through the fuse to make sure things are what they appear to be?
And also have them check for any shirt circuits
Best
JA
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