Fire light at 1000 feet on departure. Fired first bottle light remained on. Fired second bottle light went out. Landed and requested inspection by fire crew. Told engine was on fire. Evacuated aircraft. Engine change was completed a day or two ago and aircraft was scheduled to ferry out. Not sure if the Nigerians released it yet. There may be some question about the fire description by CFR. The original warning was valid. Really great job by the crew getting the aircraft on the ground in 8 minutes.