Leo Sayer has overcome terrifying health problems and now has “three stents” in his heart to keep his arteries open. The 76-year-old musician has opened up about his troubles – which included a five-week stay in hospital last year as he battled an infection – and revealed he’s overcome heart issues and undergone knee replacement surgery in recent years as well as battling irritable bowel syndrome. He told The Sun newspaper: “I’ve got three stents in the heart. I’ve got a partial kneecap replacement. I’ve got an irritable bowel. But basically, I’m good. “I’ve still got the voice and I’ve still …