There are many ways to deal with your issue. Sending the engine to Jabiru involves removing and reinstalling the engine, but at least they should warranty the repairs, providing of course, that you agreed to the work they recommend, which may be substantial. If not done already, they would want to replace the through bolts, pistons, valves, rocker bushes, upgrade to dual valve springs, check and hone barrels etc. etc. without even knowing the condition of the bottom end. Sometimes the costs can get up towards a newer generation reco. engine, but without knowing the history of the engine it is difficult to say. The other option is to ask Jabiru if they could recommend someone they consider competent near you to do the work, which may not come with a warranty...... Bob