So you're out on a job and the need to know what parts they replaced last time. Have a look in the customer job history to see all previous jobs and tech notes for the site.
Please note that the job history is only showing to technicians if you enable show job history to technicians in settings. Refer to the Mobile App settings article to find out how to enable this setting and what access it gives to your technicians.
Previous job and technician notes
In the mobile app open the job and scroll down to job history. Click on Previous job notes to see all notes from previous jobs at this site
The Job and tech notes are displayed with date and job number.
Current Job history
To check the history for the current job only click on Current job history. This will show the log of changes made to this job.