Air Conditioner- MArks

Hi

Recently i received an email from the Executrix of the ground floor unit directly below me. She had attached a picture of a wall mounted air conditioning unit above which what appeared to be a localised discoloured mark and she labelled it as a “damp spot”.

She has asked me to check my air-conditioner for any leaks and check my balcony pots for “overflow”.

I have ducted air as I am on the top level so no internal mounted unit.My motor sits on the balcony but I have checked all pipes etc for leaks and none. I have had a builder check and all pipes secure and not leaking.All pots have trays to prevent overspill and there are none directly above the common wall in question. I have provided a picture of another Unit with the same on the ground floor and the same damp spot is evident there. She said the ceiling  was painted just before Xmas and this spot has suddenly appeared.

I enhanced the photo and there was dark spots which appeared to be mold which she denies…said it was a bad photo.

What are my rights here? As she is the Executrix and not  the owner what if any are her rights? She wants this settled before the tenant moves in..

Cheers