rSeries: config changes in logs

Any changes made will be held in the /var/log/audit file. The link below is where I would start working out how you are going to see what has changed - while it is not giving the full answer it should provide a good starting point.  

K09050750: How to find recent configuration changes on the BIG-IP system

Just be aware that the log files rotate on a daily basis (between 3AM and 4AM as standard) so you might need to check multiple files to get the information you need.