It is interesting you mention the log function being what tripped up the broken node. On the CM1 and CM2, log was implemented via Feynman's algorithm for logar

It is interesting you mention the log function being what tripped up the broken node. On the CM1 and CM2, log was implemented via Feynman's algorithm for logarithms, which finds factors via a shift and subtract and then adds precomputed logarithms of them via a hit to a table that is shared by all the processors. If one of the nodes had a bad route to that lookup table (however that was actually done), it would result in just that node failing to return a result for a log instruction.