How to trouble shoot scheduled process issues

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Hi all - We have a scheduled process that detects global transfers and creates a legal employer change event.  I found a case a month ago that processed the event successfully while we just had one last week that only went into detected status and did not process.  I've tried to look through the scheduled processes to see either success or failure, but I'm not seeing anything relevant.  Does anyone have any suggestions on how to trouble shoot this?