For anyone interested, here is the procedure for removing the upper playfield.
Remove the two screws that hold the back plastic to the wooden back board.
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Remove the nuts holding the large plastic on the left side on to gain access to this screw. Remove it.
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Disconnect these three connectors from behind the back board.
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Remove these two bolts.
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Remove the rubber from the upper flipper.
Remove the diverter.
At this point you can work the playfield free. Be careful of the rear plastic as it will hang on the LED bulbs a little.