Sounds like inadequate venting for the drain lines. Could have been build this way or maybe a clog has developed in the vent pipe. Such as birds or squrrels building a nest in the vent pipe up on the ... read more
The contractor should have told you upfront that they don't deal with security systems before messed it up. It seems fair to me to let the Contractor know that you expect them to pay the bill for the ... read more