As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE PASSING 24K FEET NR 1 DRIVE ILLUMINATED, FOLLOWED QRH NR 1 DRIVE DISCONNECT ACTIVATED. ACFT GROUNDED. PERFORMED FIM 24-11 TASK 801, GCU BITE INDICATES NR 1 IDG FAILURE, DRAINED OIL AND INSPECTED FILTERS, NO CONTAMINATION NOTED. REMOVED IDG IAW AMM 24-11-11-000-801 AND INSTALLED NEW NR 1 IDG IAW AMM 24-11-11-400-801 COMPLIED WITH IDLE LEAK TEST AND OPERATIONAL TEST NO DEFECTS NOTED. GCU BITE TEST GOOD.