Southwest B737 at Chicago on Sep 16th 2014, engine problem

A Southwest Airlines Boeing 737-700, flight WN-321 from Chicago Midway,IL to New York La Guardia,NY (USA) with 118 passengers and 5 crew, departed Midway Airport's runway 22L. During climb out the crew declared emergency reporting an engine indication and returned to Midway Airport for a safe landing on runway 31C about 10 minutes after departure.

A replacement Boeing 737-700 reached New York with a delay of 2:15 hours.

The airline reported an "engine warning light" illuminated during climb out.