Got lucky and just happened to shine my flashlight under the attic floor as i came up the folding steps. I had a small gap to look into.
This was the only place I found the pipe and all the condos in the development probably had it.
The only other give away was the washer connections would twist while I was tesing them. All the stub outs were copper and the home was on a slab.
A little more insulation and an installed washer would have been a headache for me down the road perhaps.