I've had the same issue with my Yellow top Optima, replaced it thinking it was too old, but still had the slow leak somewhere in the system with the new Optima. Suspect that the Vintage Air system might be the culprit as I hear a ticking sound (even when the car has sat for a week), but haven't had the time to isolate the system and check. My only recommendation is to pull the fuse one by one and see when the current draws stops.
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