As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 GENERATOR WOULD NOT ENGAGE AFTER ENGINE START. ACFT GROUNDED. NR 1 GENERATPR SHOWS IDG FAULT. RESET FAULT. RAN NR 1 ENGINE VOLTS & FREQUENCIES CAME UP BUT WENT OUT WHEN FREQUENCIES READ 420. IDG FAULT RETURNED. REPLACED NR 1 IDG IAW AMM 24-11-11 OPS CK 24-11-00. GROUND VERIFICATION GOOD.