Left engine N2 decreases to idle in flight

[kewluk 0]

Hi Folks Not sure whats happening here but whilst in cruise at FL350 my left engine has lost power and N2 is at idle values. The engine is not responding to the throttle position at all. Engine 2 is running just fine. Anyone know what this may be? RegardsPhil Charnock

[blueb0g 0]

Check your failures.

[kewluk 0]

I've checked and there are no failures showing in the FMC, I've shut the engine down and restarted it but it still wont go above idle.