According to the A330 flight crew training manual and the UAS drill, a 5° pitch up at cruise altitude is not the correct response to the UAS memory items. The correct response is to maintain level flight and troubleshoot.
PJ2,
The FCTM you quote must be an Airline's customized version ... ?
If so, that Airline did a very good job by stating things clearly, which Airbus has not done yet.
For Airbus, as
quoted earlier by
A33Zab, the correct procedure is to take initially 5 degrees NU + CLB thrust :
The initial pitch attitude and thrust values given in the QRH should be considered as "Memory Items", since they allow "safe flight conditions" to be rapidly established in all flight phases (takeoff, climb, cruise) and aircraft configurations (Weight and slat/flaps).