As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 SOURCE OF LIGHT ILLUMINATED ON DESCENT THROUGH 13,000 FT. ZERO VOLTS AND AMPS ON GEN 1, BUS WOULD NOT RE-ENGAGE ON ENGINE GENERATOR. BUS DID RE-ENGAGE ON APU GENERATOR. ACFT GROUNDED. REPLACED NR 1 ENGINE IDG IAW MM 24-11-11-000-801, 24-11-11-400-801. OPS LEAK CHECK IAW MM 24-11-00-700-802.