As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FINAL APPROACH, RECEIVED A SOURCE OFF LIGHT FOR THE NR 1 ENGINE. RAN CHECKLIST, THE GENERATOR DID NOT COME BACK ONLINE. USED APU. NO VOLTS OR FREQ'S ON GEN 1. DRIVE LIGHT WAS NOT ON. ACFT GROUNDED. REPLACED THE NR 1 ENGINE IDG IAW AMM 24-11-11. OPS CHECKED ACCOMPLISHED. OPS CHECKED GOOD.