You need to remove it and strip it off the hardware and undo the truss rod then set it on a couple of wooden blocks on a table and gently apply a clamp to the centre of the fretboard bowing the neck to open up the cracks enough to inject wood glue using a syringe to fill them all up, then release the clamp and flip it over before lightly clamping again to keep the cracks closed while you wipe up the excess glue and leave it for 24hrs.
Cool, I appreciate you taking the time to reply and put some details I to it. The neck has been removed and all the hardware, just need to get the truss out.
Might have to get more clamps. I think I need to do it in three sections. One side, middle and another side, just the only way I can get the best evened out work done to it.
Fortunately got other guitars to play in the mean time.