Sounds to me like there is no structure around the ac unit. The only way to fix this right is to remove the roof panels from the inside and see if there is cross supports close, running from side to side. Weld or self tapper new structures (tubing) into these supports and create a box around the ac unit seal. If this continues to leak, eventuall water will find its way to the outer part of the shell delaminating cabinets or possibly the side walls. I have learned this the hard way.
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