I am purchasing a house recently. During the inspection, the inspector spotted some water on the basement floor. He thinks it may be due to the leaking pipe or condensation from the refrigerator upstair. However, after I talked to the owner, he said that in the powder room above the basement, when the flipper in the toilet stuck, the water will keep running and some water may back flow and drip down to the basement. If the toilet flushed properly, no water will drip to the basement. From our conversation, I feel that the dripping has nothing to do with the flipper in the toilet, it is more likely that the seal is broken. Can someone tell me that my gussing is right? how hard is it to fix it by myself? if the plumber is called in, how much does it cost to fix it? or should I back out of the purchse? Thank you for your advise.