As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 1 GENERATOR SOURCE OFF LIGHT ILLUMINATED. COMPLIED WITH QRH PROCEDURE. ACFT GROUNDED. REMOVED AND REPLACED THE NR 1 IDG IAW AMM 24-11-11. VISUAL INSPECTION OF FILTERS SHOWS NO VISIBLE CONTAMINATION. OPS CHECKED GOOD AT THIS TIME IAW AMM 24-11-00.