Are the AC units ducted? If so, the water may not be coming from that unit, but running inside the duct from the rear unit.
I would check your condensation drain lines to see if they are plugged. The duckbill ends have a tendency to catch & plug up the lines. I would blow out the lines with a compressor. Best to go from the unit out. If you go from the duckbill ends, you may find out that a connection inside the AC unit doesn't have a clamp on it - resulting in water dripping inside like you have now. Just a little real time experience.
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