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My 1st look would be at the wires to the shift lever light and the one in particular that controles the over-drive. I had a problem like yours but did not detect any battery drain mainly cause I didn't look to see if there was one going on. But I did find the solinoid wire from the over drive-button was broken. That could be where you drain is occuring or from the light at the shift lever ---there's a lot of motion going down there every time you shift and thus causes the wire to fail.
Let Me know if I am correct --always learning!!!!!!!!
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