Exactly what kind of "leak" causes loss of power?Eventually on one trip to the dealer they identified a leak which caused the loss of power.
What did they do to resolve?
Do you have all the documentation for this?
Additionally -- I sure hope that you have ALL the printed documentation of previous visits to dealership when you were complaining about 'loss of power" These may be your leverage to help convince SOA to cover your repairs.
If you do not have said documents.... suggest you go to dealership and ask them to reprint for you everything they have regarding your previous visits to dealer.
The proof that you had a problem and took it to dealership in the past is a pretty STRONG case.
In the end, If it comes to it, they have to PROVE that you somehow did not follow the owners-manual maintenance or were negligent.