Mine drips right from the a/c unit... sometimes way more than dripping. It occurred to me today that the sag could be forming a pool that is above the sill of the a/c unit.

I'm beginning to wonder if the leak dripping (sometimes WAY more than dripping) from my a/c unit is the sill of the a/c now being sunk below the waterline of the pool that forms in the sag in the roof.