When your mechanic completes a task and marks it as "resolved" it's saved as a vehicle maintenance log, which is found in the "Log" tab. Mechanics also log unscheduled maintenance tasks here - it is the record of all service completed on your vehicles.
Log unscheduled maintenance tasks:
In addition to checking the maintenance log, administrators can create log entries for vehicles to log when unplanned service on a vehicle has been performed. Simply click "Log" from the Maintenance screen and then "Create Log Entry." From there the following screen will be shown:
As shown in the screen above, administrators can configure the vehicle that required service, record the odometer reading and the date of service, and write notes on whatever service was done.