As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1869 EN-ROUTE MCI - PHL. THE AIRCRAFT WAS GROUNDED. IDG 2 OFF BUS CAUTION MSG OCCURRED IN FLIGHT COMPLIED WITH QRH MESSAGE REMAINED ON. THE FLIGHT DECLARED AN EMERGENCY AND DIVERTED TO IND WITHOUT FURTHER INCIDENT. MAINTENANCE INSTALLED SERVICEABLE NR 2 MAIN GENERATOR CONTROL UNIT IAW AMM2 24-21-19-000-801-A. OPERATIONAL CHECK IS GOOD AT THIS TIME. AIRCRAFT OK FOR SERVICE.