A tenant's text: wood flooring

[Jem J.]

Hello BP ,

Herewith is a copy of my tenant's text. She is renting one of our rentals which is on a high end complex. (High ceilings with exposed beams, 2BR 2.5 Ba, all granite counters, all hardwood....and at least 20 or so steps to go up the second floor. This is her text:

"Hi Jem, the floor near the upstairs closets is starting to rise. It is now harder to shut the door to the utility closet with the ac heating unit as well as the storage closet. Could be because of something with the downstairs shower and the moisture rising? I am not too sure. Also - I tried your solution with the vinegar in a bag but it is very difficult to do with this shower head. I don't feel comfortable with 64 oz of vinegar hanging from it. Doesn't seem sturdy enough to me."

  More info on my prop...The first floor shower has a   wrap around tile including the ceiling. I think it is Quite impossible for this to create moisture to " lift the hardwood flooring" ON the second floor,  to include the rooms a distance  away from the ist floor shower. 

AND ..  The shower head ( huge shower head suspended from the ceiling tray.... I suggested a MIXTURE of vinegar and water to clean,  when she complained that it has " mold" looking stain in the shower head. Sent her a google link to read on her own on how to maintain and to keep it clean from hard water/ mineral  deposits. 

My biggest concern is the hard wood flooring. My plan is to go there to assess the damage and primarily take pictures.  Anything else i should be mindful of and take caution in this case? I was planning to go there this Sat. but changed my mind to sooner than later. Landlords... any take on this one? This is my first " big" complain so far. To note, laundry is on the second floor. 

Thanks.

Jem