There are two ways to tell if the timing belt has been replaced. One is obvious-you are looking at a service receipt showing the replacement.
Swimlane diagrams are used whenever you need to show activities, tasks, or process steps which are being performed by different actors/roles. You can use swimlanes to group activities in an activity diagram or process flow by any category what you need: by role, by system, by department, etc.
A swim brief refers to any briefs style male swimsuit such as those worn in competitive swimming and diving. The popularity of the Australian Speedo (est. 1928) brand racing brief has led to the use of its name in some countries (e.g. the United States) to refer to any racing brief, regardless of the maker.