Update: upon closer inspection of the curb, I found 4 brackets that attached it to the wall and riser. the screws in the bracket were so rusted I could not remove them. so i got out my trusty 16 inch roofers prybar and removed the riser. the heating duct is exposed. It has two small holes in it( the bathroom now has a heat). I am not going to reroute the duct. aside from standing on my head and wiggling my feet in the air, it was pretty easy to install new toilet. no leaks. removed and reinstalled water filter under galley sinks thus eliminating a leak problem there. now, on to the next adventure .
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