Aer Lingus A320 EI-EDP operated a Dublin – Dublin training circuit as EI990 early this morning making several approaches at Shannon. The aircraft then operated the EI232/EI233 Dublin – London Gatwick rotation before positioning Dublin – Shannon as EI992 in order to operate the EI386/EI387 Shannon – London  Heathrow rotation. This was due to an earlier A320 technical issue at Shannon. The aircraft positioned Shannon – Dublin late in the evening as EI995.