[JohnN]

First, thanks to everyone who posted. The tips made me think.

My initial approach was to a) tell my wife to live with the lania door not closing. That didn't work. b) tell her to "call the guy", that didn't work either! c) I didn't even try to say "you fix it" - though she did help a lot in holding the door while I removed the hinge screws.

So, adjusting the door seemed like the best first approach, compared to grinding concrete. I took the door off and the bottom of it was a lightweight aluminum rail, not really a sweep.

I didn't have a grinding disc/wheel, so.. I took my handy little sledgehammer and gave the bottom of the aluminum a few whacks. Then I put the door back up and VOILA, it worked fine - fingers crossed.

As far as the buckled concrete, it's the patio slab away from the house foundation, so it is what it is. Like someone posted, a low grade concrete composite and it'll have to do for now.

I'm glad it worked, and thankful for the tips that made me think and work it through. TOTV is the best! Be safe out there, it's a strange world.