I have a client that purchased a 3 flat building and renovated the 3rd floor unit to occupy themselves. The building is on a steam boiler and they had the radiators removed in the 3rd floor, replaced with a new HVAC setup. A few months back, I noticed some cupping and what looks like water damage in the master bedroom where the radiator used to be. I couldn't find and water anywhere - no damage to walls or ceiling or trim... just the floor. It's been getting worse and worse and I finally insisted the owner contact the contractor that did the work to come take a look. The contractor confirmed the location of the radiator and that he just capped the steam pipe. He also said that the cupping of the floor is normal because the pipe is so hot and it's so close to the floor in that spot - claiming that the warping is due to the heat and not water damage.

Here's some photos, may I have your opinions please? Before winter, before the boiler kicked on - the floors were smooth just being sanded down and stained.

Thank you for taking a look!

https://drive.google.com/open?id=1tEAHV ... 5DpGCuh2vA

https://drive.google.com/open?id=1UjdkI ... wMw35gWpZD

https://drive.google.com/open?id=1AnJF2 ... CVupLDGO00

https://drive.google.com/open?id=1ZhSSE ... 8dEBSRaiq8

I'd say there's a leak, thats not just from a hot pipe unless there's a considerable amount of condensation forming under it.
Anyone got a professional grade moisture meter there? Did the hardwood guy cap the pipe? You could also call a flooring inspector. Prolly have to do some demo.