Interestingly:
One or two years ago I heard a rumour of a later updated model of the Gulfstream GIV, the G450, that had damage to its primary flight control system with the suspected cause being improper engagement of the gust lock while there was still hydraulic pressure in the system.
The rumour was that one or more of the flight control actuator mountings had been damaged and the aircraft had flown in that condition for some time.
Dont ask me which flight control axis, what aircraft and where it occurred as I really dont remember but it was a rumour and I would have thought that only damage possible would have been to the locking mechanism and not to the flight control runs.