The first one is correct. The second one seems incomplete.
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AlpheccaStarsThey returned the item to us after repair, but on checking, the item was found to have the problem again.
AlpheccaStarsThe sentence is not clear on who did the repair or who found the problem.Hi A/S.
AvangiI agree completely with your statement, but does that make the sentence incorrect?No, it is grammatically correct. But to communicate clearly and unambiguously is especially important in business English.