As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ARRIVING, THE NR 1 ENGINE SOURCE AND DRIVE LIGHTS AMBER ILLUMINATED. QRH FOLLOWED AND LANDED WITHOUT INCIDENT. ACFT GROUNDED. REMOVED THE NR 1 IDG, REF MM 24-11-11-000-801. INSTALLED THE NR 1 IDG REF MM 24-11-11-400-801. OPS AND LEAK CKS GOOD, REF MM 24-11-00-700-802 & 71-00-00-800-811-F00. GROUND VERIFICATION SUCCESSFUL. OK FOR CONTINUED SERVICE.