New HDD still shows as faulty drive 1

My 2 bay My Cloud EX2 Ultra indicated that disc 1 was ‘bad’. I purchased a brand new 6TB WD red HDD. Following a ht swap the new disc is also showing as bad. The probability of both HDDs being faulty is fairly low, which suggests there is a fault with the enclosure. How do I diagnose possible faults? Thanks


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