Roughly one in five of the euro zone’s top lenders failed landmark health checks at the end of last year but most have since repaired their finances, the European Central Bank said on Sunday. The ECB found the most critical problems to be in Italy, Cyprus and Greece but concluded that banks’ capital holes had since chiefly been plugged and that only 10 billion euros remained to be raised. Italy’s financial sector faces the biggest challenge with nine of its banks falling short.