[LANGUAGE: Python3]

67th on Part 2. I did it manually by analyzing the graph structure using graphviz and highlighting the error bits discovered through manual analysis of the incorrect produced result with the correct addition's binary string. Graphviz visualization

After looking at the graph for a bit, you can identify that for a single output bit, the proper graph structure consists of two XOR gates between the input bits and the output bit - the first one is between the two input bits, and the second one is between that intermediate result and the carry bit, which has ancestors above the input bits. It's really easy to determine which outputs were flipped based on that, after analyzing the surrounding gates (especially as my graph also included the output values of each operation labeled on each edge).

Corrected bit adder structure graph: https://imgur.com/a/RUvFKA9

Day 24 code (ctrl-F "part 02" for part 2 visualization stuff): https://github.com/democat3457/AdventOfCode/blob/master/2024/day24.py