What is the issue with Cathay Pacific's A350 Rolls-Royce engines?

Cathay Pacific Airways is inspecting all 48 of its Airbus A350 jets after an engine component failure in a Rolls-Royce engine on a flight from Hong Kong to Zurich. The plane landed safely back in Hong Kong. The airline has canceled multiple flights and is also examining its A350-900 aircraft as a precaution.
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