So, the first thing to do is to perform a careful visual inspection. Reseat all chips and connectors. Verify that the supply voltages are within spec. Then try replacing the chip at F12. Keep peeling the onion, a layer at a time, until you've shed enough tears.

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Very poetic, Tom. Of course we are talking about a 128K which means there are only two removable chips on the entire board, the ROMs. I suppose it's worth re-seating them, since the self diagnostic is encoded in the ROM (it is isn't it?).

The soldering process is otherwise straightforward on the M0001 boards. Flip it over, carefully desolder each pin and the chip should fall right out.