As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: #1 ENGINE INTEGRATED DRIVE GENERATOR OVERHEAT REACHED 185 DEGREES CELSIUS AND DISCONNECTED BY ITSELF. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO LAS WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. REPLACED #1 ENGINE INTEGRATED DRIVE GENERATOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 24-21-51.