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This is the info on the receipt

On the receipt they called it PCM upgrade TSB 011203.

Under the hood it is labeled as

1R3A 12A650-AC

Change authority #02301.

The change is to address some pinging on initial throttle tip-in which was louder on the early production Bullitts.

The dealer wants to hear you say that it pings when you firs step on the gas.
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