[Stripit]

Yes, the seal may have been flattened by the a/c unit movement, even if it was a slight move caused by the breaking of the shroud. I pulled my a/c unit off and replaced the seal. Not as big a job as you would think. You might bre able to remove the shroud again and tighten the a/c unit down to the roof a bit to see if you can seal it up again without lifting the a/c unit off. Worth a try. The rain water is getting past the seal then water then drops into the ductwork and will run to the lowest point.