Customer had us out because they had a new sink installed by another contractor and now water will not stop coming from the drain. I got there and found it was the ac condensate line that was tied into that drain and stopped up somewhere. It took a few tries but eventually I was able to clear the stoppage with my small sewer machine. I then poured over a gallon of water down the line to make sure it is not still stopped up, which it is not. The customer then asked me if I could install the drain for that new sink but the issue is the new sink sets lower than the old so if someone were to connect the drains, the new sink would not drain very well if at all. To fix this you need to lower that drain line in the wall but the problem there is the washer machine is tied in right below it so to make it all work right you would need to redo all the drain lines in the wall right there. I left an estimate for this to be done. I found no further issues at this time.