At one airline there was a problem which, on an MOR investigation, was primarily caused by an overtired Line Engineer who had worked (or been awake) for some 18 hours when he made the said mistake.
After some debate it was decide to re-write the company policy to appease the CAA that some action had taken place.
After further debate, between management and "Quality", the policy was re-written to allow engineers working hours of no more than 24 per day.