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Fault in Caravan 240v wiring

The mains wiring in my 5th wheel trailer home has failed the EWoF as there is no earth & the Live & neutral seemed to be swapped over. Last checked & passed 2 years ago, same electrical inspector. Fault still present when HWC turned off, and 12v converter unplugged. We need to isolated the faulty circuit and repair or replace the wire, plug or whatever! Would like it fixed as soon as, but it's not really urgent!