It's been a while, but what I remember is that there are 2 phillips screws on the inside unit shroud. You remove them and take the inside shroud off (as if you were going to clean the filter). Then there are some bolts (sorry I can't remember how many or exactly where) which go up through the square vent hole and hold the inside and outside parts of the air conditioner together. These are the bolts I needed to tighten. Tightening the 2 phillips screws that hold the inside unit on is a good idea, but won't help a leaker.
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