Hi. Strange that the fuse was out . Possibly someone was trying to hide the fault.
Anyhow , sounds like a poor electrical connection. May be pump internals as they do go bad.
Best thing is to remove the elecronics module from the square block ( usual power down op first ) . This is the only part coded to the car so no worries.
Remove the pump motor from the square block carefully trying not to dislodge the eccentric disc that the pump shaft passes through . This disc sits between ball/spring operated pistons in the square block. If you do dislodge the disc it can be fiddly to get back in .
Un-plug the main harness. The pump power pins pass through the square block on a long connector . Usually , it is tarnish / corrosion causing a bad connection . You can put 12v across the pump to make sure it runs OK before refitting.
No hydraulics , brake fluid or bleeding involved.
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