layer 28 activation on different attention heads - does the uncertainty signal come from specific heads or distributed

been reading through the threads on layer 28 firing high before hallucinations and wondering if anyone has tested which attention heads are actually contributing to the high activation.... like is it one specific head that does uncertainty tracking or is the signal distributed across all heads in layer 28. if its a specific head we could maybe steer it more precisely, but if its distributed that suggests uncertainty is emergent from the whole layer which is... harder to work with i guess