Component: L31_MLP
Hook: blocks.31.hook_mlp_out
Layer: 31
Role: L31 MLP's output strongly points toward the correct answer in projection tests, but this projection is not answer-specific. The true answer gets a high logit, but operands and pair sums also receive high mean logits. Directly removing or mean ablating L31 barely changes accuracy, so its signal is redundant in the full circuit.
Additional note: L31 is retained as the clearest lens-positive but causally redundant MLP. It has the strongest single-MLP answer lens signal (answer top-5 = 0.566),  at the same time, isolated direct zero-ablation barely changes accuracy, and corrupt-operand patching produces zero flips for A/B/C. Its high mean logits for answer, pair sums, and individual operands suggest broad final-logit amplification rather than a clean arithmetic operation.