There supposedly is a 1/4" nut driver on the tip of the tank fill bolt, to be used for tightening the nut in the center of each solenoid, as Jim mentions. Thanks for noting that, Jim; I'd forgotten about it as a primary option.
You can also turn that nut counterclockwise not beyond 4 1/2 turns to release pressure if you should ever need to move a slide manually.
Joel