1) life of components.
2) whats recently been changed?
3) recent performance tests - ecu ppi's, track/balance/vib figures, oil comsumption for all major boxes,
4) the usual once all over but pay particular attention to all head/drive components.
5) if theres any health monitoring on board awesome but if not head could have been over torqued at some time
the list is endless really!!!!!!!