All calendar items and a complete 300/100hr on airframe and engine.
Calendar items include TT straps, ELT, aircraft battery, Spline lubrications, Purge greasing everything, oil and filters, fire ext, first aid/survival kit, any other kit inspections (inlet filter?).
If the engine was not properly preserved, there are procedures in the manual for ground runs. You may have trouble with FCU/governer depending on the conditions it was stored in.
You would have to see the airframe and engine manuals for a complete list. There is always the danger of corrosion you can't see affecting the bearings and gears inside the gearboxes.