Line break?

[xcal777]

Weep drain was backing up by washer drain. Kitchen sink and dishwasher does not backup. Bathrooms drain fine. Plumber came out and snaked the clean out outside by the kitchen. Said about 30 feet under foundation he hit mud. Does this sound legit. If so how does one find exactly where the break would be?

 

[TomFOhio]

Have a drain cleaning company run a camera thru the drain. They can tell you how far it is and where by their
camera. Don't wait until it backs up again or they will have to snake it first as no water should be in the drain when
doing this procedure.