In this code the relationship itself is not under threat. There just seem to be difficulties which need to be faced and overcome. But there is a need to know what the problem may be. Dealing with an unknown problem is impossible. If behaviour indicates that there may be some problem, then code 13/7 is a request that the problem be stated and clarified: 'What is the problem?' There is some linkage here to the mood code. Some people may even want to use the mood code in such situations. There is a sense or suspicion that something is wrong. That needs following up.