As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: IN CRUISE AT FLIGHT LEVEL 380 NUMBER 2 DRIVE LIGHT ILLUMINATED RAN QUICK REFERENCE HANDBOOK PROCEDURE. APU WOULD NOT START EVEN AFTER DESCENDING TO A LOWER ALTITUDE. DIVERTED TO ICT. REPLACED NUMBER 2 ENGINE INTEGRATED DRIVE GENERATOR PER AMM 24-11-11.