SBC advanced plus shore power battery charger help?

Cactus Sailing

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30 May 2013
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Keeps coming up with an error E1 even with nothing connected to the outputs it still comes up with this error and obviously is not charging my batteries

Is it knackered or repairable? New ones are about £180 but I can’t find anything else at fault other than this, anything I can test or try? I’m thinking it’s a diode gone which thinks it’s got a sort circuit hence the fault?
 
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