spliffy:
I would not detune your ALEMBIC for storage over any length of time.
The action of your bass is the product of a balancing act; i.e., the tension of the strings you use versus the particular stiffness of the neck system of your bass. JetPowers is right: It's built for this.
You won't damage anything with the strings limp. However, wood is imperfect inasmuch that a repeatable application of tension will not always result in a repeatable amount of relief along the neck. Since action is measured in thousandths of an inch. only a little difference will be noticeable to your hands. When you eventually retune, it will hardly be surprising if you don't find yourself thinking that something feels different. If you are able to feel small changes in the way she plays, be prepared to 'touch up' your action, very easily done on an ALEMBIC.
I'll skip the airlines disinformation. Detuning a guitar came from the old days with acoustic guitars, who were considerably more delicate and fussy than a modern Taylor or Martin. 12-strings could be especially troublesome because of all the tension, resulting in swollen tops at the bridge, usually on cheap 12-strings. The paint checking came from the lacquer finishes and sudden temperature changes. Again, the older finishes weren't as durable as modern lacquers, and Gibson's quality control in the 60s and 70s didn't help, either. ALEMBICs have oil or urethane finishes, so this is of no concern to us.
J o e y