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Assuming nothing has knocked the slide itself out of square and there is nothing stuck underneath the slide floor ... open the slide about 1/3 of the way. There are a couple of carriage bolts and a pusher bolt per slide support arm. Loosen the carriage bolts slightly and adjust the left pusher bolt up a bit and the right pusher bolt down a bit (you may have to tap the support arm on the one going down). I'm talking a turn - turn and a half at the most because a little goes a long way. If the slide is straight up and down and just not centered in the wall opening anymore ... loosen the carriage bolts and tap the support arms maybe 3/8" both in the opposite direction you want the slide to center to. Do nothing with the pusher bolts. There will be at least two big nuts on the cylinder rod ... do not tighten both up on the bracket as the gap is there for a reason ... the cylinder has more stroke than the slide can physically move. This adjustment can be easily done by the owner if you remember that a small adjustment makes a big difference. I'd check for anything under the slide or jammed behind the wall fascia before spinning any wrenches ... or be sure you're not cocking the frame by sitting on really unlevel ground.
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