Hi Kal,
please chek in MyAutosupport if the most recent ASUP tha you have has the same time of your reboot, if not generate a new one with subject "WEEKLY_LOG" I have done that before when I want to check something has change in MyAutosupport after the fix or change. Also you can download the last version of Config Advisor and run it againt your cluster, normally you can see same errors/warnings within the output.
hope that can help.
regards,
Miguel Valls