The answer is straight forward to anyone that has flown GA in Australia..You don't log defects in the maintenance release because you get a reputation for being a grass and you get the sack. If you decide to risk your job and log the defect always make sure you have the chief pilots approval to write it up. He may want to hide the defect from CASA in case a couple of charters come up and he needs the aircraft. Only the chief pilot knows the Big Picture...