replacing mechanical parts of flash

I recently put my 6000 into a bag when loading the car and didn’t pay a huge amount of attention to it and whatever controls the flash popup appears to have broken somehow. It’s not that the button doesn’t pop the flash up, more that some part of the mechanism has broken so it’s permanently popped up.

I have a feeling I need to replace it but I don’t want to spend money, only to find out the case is broken rather than the flash unit or vice versa. Is there any way to tell?