MADRID/FRANKFURT, May 23 (Reuters) – Siemens Energy (ENR1n.DE) warned on Monday that a turnaround at Siemens Gamesa (SGREN.MC) will take several years, adding that a 4.05 billion-euro ($4.3 billion) bid to buy out minorities of the struggling wind turbine unit was the only way to fix the issues. “It’s nothing which will go fast,” Siemens Energy Chief Executive Christian Bruch told journalists on Monday, less than two days after unveiling the offer. He added this meant “multiple years of really turning” Siemens Gamesa around. Siemens Energy has faced pressure from shareholders to raise its stake in Siemens Gamesa from […]