2004 Mazda RX-8 Engine Warranty Question?

I have a 2004 Mazda RX-8 that has an 8 year, 100,000 mile warranty on the engine. My spark plugs fouled out, and my coils broke down. The dealership told me they would cover the spark plugs, but said I had to pay for the coils. My question is, since the coils are part of the engine, shouldn't they be covered as well?
 
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