Passing completion but not score to vendor's LMS

I'm publishing a SCORM-compliant module for the first time, and providing it to our vendor to upload in their LMS. They reported back that the completion status is passing through correctly, but not the score. I know this doesn't give you enough information to really diagnose the problem for me, but I would appreciate some ideas on what parameters or variables I should check to get to the source of the problem. What would your 'troubleshooting checklist' look like? Thanks!!