Does anyone have the pinout for the internal keyboard connector on the PB1400?
The one that I had declared "dead" works just fine hooked up to external monitor and kb/mouse with the lid closed, it's only with the lid open that there are problems.

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There isn't really a "pinout", as in signals, the 1400's KBD is a simple membrane/flex-circuit key-switch matrix that feeds directly into the controller on the MLB. It would seem to me that your problems lie within either the KBD controller or the Power Manager circuitry. I seriously doubt that hacking the KBD switch matrix connector would solve anything for you, especially sincet it exhibits the same behavior with no on-board keyboard installed.

Try re-setting the "Power Manager" and that may help, but it's likely your first diagnosis was correct.

Meanwhile, I'll try to find the 1400 KBD I opened up for fitting it to the (as yet of undetermined direction) PB100 hack. If I can find it, I'll let you know which connections are related to the power key, but they're not likely to be a dedicated connection. ISTR that there weren't all that many lines on the matrix halves, considering the number of keys.

Finally, an update to my sales, I am taking machines in in half an hour for shipping estimates (and in one case, actual shipping.) This is, finally, certain.

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I'm looking forward to receiving your prices & shipping estimates!