"If the parking brake has been released manually in response to a malfunction, only technicians can return it to operation." - I got this from the manual.

This is quite misleading. I may have understood it wrongly. After seeing the word "malfunction" there, I think you may be right.

Correct me if I'm wrong, but the way I understand this is if i manually release the parking brakes because of a malfunction, only technicians can return it to operation. Therefore, if I release it manually without a malfunction, technicians won't have to return it to operation.

Did that make sense?