I don't have my FSM here with me (on the road) but I would have to guess that it's the switch/ black button in the rear of the door opening just above the sill.
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"Betsy Blue" One Owner?
Over 1/2 way to 1/2 a million miles
The only known 5-spd S/C Reatta on the Road.
BCA 37147
and Member BCA (The Bluewater Cruising Association)