It is not difficult if it is a matter of a damaged relay, this is, if part of the module is working. If I am not mistaken it is a module that have a lot of outputs, grouped with several commons.
The first thing that I would do it to force a exit to turn on (high). A led with the number will appear. If you know that the module it is faulty, then you probably also know the output that it is not working properly.
After that, you can check if the output really got to the desired state with the help of a voltimer, between the respective common and the output. On the small plastic that you must remove to access the outputs you have the output diagram. Most faults are: the relay did not triggered OR the relay got triggered, but when it receives instruction to un trigger it got stuck and the output will act as the controller is still issuing the high command.