A Lufthansa Boeing 747-800, registration D-ABYD performing flight LH-430 from Frankfurt/Main (Germany) to Chicago O'Hare,IL (USA), was enroute at FL320 ove rthe Atlantic Ocean about 250nm south of Keflavik (Iceland), when the crew decided to turn around and return to Frankfurt due to a problem with one of the engines (GEnx). The aircraft descended to FL300 for the return and landed safely in Frankfurt about 5 hours after departure. Passengers reported the captain announced a "Motorschaden" (engine damage). A replacement Boeing 747-800 registration D-ABYJ departed Frankfurt with a delay of 9:15 hours and is currently climbing out of Frankfurt.