1993 Aerostar Door Ajar Lamp On

I have a 1993 Aerostar that the "Door Ajar" lamp stays on constantly (with the ignition on).
All the door switches work properly, interior lights go on and off when they
should, entry light system works properly.
Other than removing the warning bulb in the dash, any ideas on how to fix this thing?
Bob
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Find out which door ajar switch is always closed and replace it.

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