An out-of-bounds score in the state’s weekly reopening report creates the possibility that San Diego County could fall to the most-restrictive tier in the COVID-19 ranking system next week.Released by the California Health and Human Services Agency on Wednesday, the weekly scorecard lists San Diego County with 7.4 coronavirus cases per 100,000 residents. That number is slightly greater than the limit of 7, the demarcation point between the red and purple tiers of the state’s COVID-19 risk-ranking system.