Mine is bathroom leaking, a new 3-storey house under reno. After I did my own ponding test, I found out bathroom leaking, water mark on ceiling at 1st & 2nd floor staircase. Developer has bn working on it fr 1++ mth. You better fix it now, no joke when it comes to leaking.

If it's a new hse, I wud suggest to do ponding test in all yr bathrooms.