As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT AFTER ENGINE START, EICAS MESSAGE APPEARED RT GENERATOR OFF. A/C RETURNED TO BLOCKS (BTB). DEFERRED RT ENGINE IDG IAW MEL ABX-24-00-1-1. MBCB 04/03/25. PLACARD INSTALLED, MAINTENANCE ACTION C/W. AIRCRAFT REMAINS NO ETOPS. A/C RETURNED TO SERVICE.