I know of someone that was "prosecuted" by CASA for carrying out maintenace on an aircraft. The said person was not a LAME nor a qualified AME.
This person purchased a damaged and unregistered certified aircraft type which he subsequently rebuilt in his garage. despite having no formal qualifications he did an A1 job with a high standard of work, used all manufacturer supplied replacment parts with the correct release note and tracability.
The s--t hit the fan with CASA when he went to register the aircraft and apply for a new certificate of airworthiness to be issued.
The problem was, he was not "authorised" as someone that could carry out the mainteance under CAR 42 ZC Mainteance on an Australian Aircraft in Australian teritory.
The definition of an Australian Aircraft is described in para 3 ( Interpretation) of the Civil Aviation Act.
3 Interpretation
In this Act, unless the contrary intention appears:
Australian aircraft means:
(a) aircraft registered in Australia; and
(b) aircraft in Australian territory, other than foreign registered aircraft and state aircraft.