Thanks Couch. I compared jobParams from the XMPDB2 database between a successful/unsuccessful impositioned job. I had the value for 'CutMarks' and 'PageInfo' incorrectly set as '0' instead of Boolean. Once corrected, the impositioned job submitted without error.
# Caused Error
imp_CutMarks = {'m_Name': 'CutMarks', 'm_Value': '0'}
imp_PageInfo = {'m_Name': 'PageInfo', 'm_Value': '0'}
job_ticket.SetImpositionParameter(user, pw, job_ticket_ID, imp_CutMarks)
job_ticket.SetImpositionParameter(user, pw, job_ticket_ID, imp_PageInfo)
# Worked correctly
imp_CutMarks = {'m_Name': 'CutMarks', 'm_Value': False}
imp_PageInfo = {'m_Name': 'PageInfo', 'm_Value': False}
job_ticket.SetImpositionParameter(user, pw, job_ticket_ID, imp_CutMarks)
job_ticket.SetImpositionParameter(user, pw, job_ticket_ID, imp_PageInfo)