I had I new fly wheel installed for my transmission, but 6 days later my car won't go into park, does the mechanic that I when to have to fix the problem at no extra charge?

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I took my 96 Chevy Tahoe to get a replacement fly wheel installed for my transmission i was charged $412 for parts and labor, but 6 days later my car couldn't go into park. Does the mechanic I when to have to fix it at no extra charge?