Saw that one engine was stuck in a 'sub idle' stall. Years ago our company had at least one similar event. Unfortunately it happened to both engines. Shut down one engine, restarted, and it operated normally. Second engine was then shut down and restarted. Again, normal ops(with higher heart beats in the cockpit).
Flew with engine anti ice on during all descents(higher idle speed) until the engine FCU's could be reprogrammed.