Indonesian pilots had reported multiple problems with an ageing jet's throttle system before it plunged into the sea after takeoff in January, killing 62 passengers and crew, investigators said Wednesday. The malfunction in the Sriwijaya Air Boeing 737-500's engine control system was highlighted in a preliminary report on the January 9 crash, but investigators said it was too early to pinpoint an exact cause. The 26-year-old plane previously.