Could someone help me with running this task between two modules, please?

A contact has 3 custom fields (check boxes A, B, C) that are manually filled. A job is created for that contact. This job has another custom checkbox X. It needs to be automatically checked if either of those A, B, C boxes are checked.

Multiple jobs can be subsequently associated with a contact. Everytime an action needs to be done to see if checkbox X needs to be checked or not based on the same criteria. Thank yuo!