You are going to need a tech out. Call tech support, and request a tc. While it sounds like you have done everything, you MAY want to consider getting Cox Complete Care, to ensure that it's not some kind of fitting or something inside the home, and save you a 75$ service charge.
I appreciate the info! I believe I will reach out to the building manager for my apt to see if they can test the connections first and determine if their is break or damage to the cables in the wall before calling out a tech.