As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO MAINTAIN CABIN PRESSURE ABOVE 18,000 FEET. TOTAL FUEL ON BOARD WAS NOT ENOUGH TO CONTINUE TO ORD. DIVERTED TO IND. *S/D* INDIANAPOLIS MAINTENANCE PERFORMED A CABIN PRESSURIZATION SYSTEM TEST AND SYSTEM WAS CLEARED AS CHECKED OK, NO DISCREPANCIES NOTED.