Good afternoon everybody, I wanted to give an update on how this turned out.
In short, I believe the 1M & 1N designations in the RAM parity check refer to the placement on the board relative to the cluster of RAM chips.
After laying out all of the pathways and circuitry schematic I could determine relevant to those chips, I could not find anything that could conceivably be causing errors to the order of a bad diode/capacitor/transistor/etc.
I ended up going with a gut feeling and replaced the two RAM chips that would coincide with the first row of chips, aligning with board columns M & N. Sure enough, now there's no more ram parity errors. It's very early on yet as I have not been able to get back, but it also appears that my screen layouts are much better and after rerunning the parameter punched tape I have no more errors, short of A44 which is just resetting the hour meter on either the coolant or gear oil filter, not sure yet.
Anyways, just wanted to share that bit of knowledge with the world.
Thanks

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