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The p1703 and p1780 are likely not an issue. Those codes are cause by not cycleing the Overdrive switch and the Trans range switch at the appropriate times during the computer self test. The most likely suspect for the B2736 code is the secondary brake pressure sensor that is mounted to the front side of the brake booster to the left of the master cylinder when facing the vehicle. It is an integral component of the master cylinder on vehicles with stability assist and not sold separately.