As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALT, LEFT GEN DRIVE LIGHT FIRST THEN GEN OFF. 1X GEN OFF RESET FAILED REF FM 2.60.35 ON ARRIVAL LEFT IDG DELTA P POPPED OUT. IDG FILTER REMOVED AND FOUND CONTAMINATION. IDG REMOVAL/ INSTALLATION CARRIED OUT I.A.W AMM 24-11-01-004-002-006/ 24-11-01-404-001-006. INOP IDG SHAFT HAD SHEARED. LEFT ENG GROUND IDLE RUN CARRIED OUT I.A.W 71-00-00. OPERATIONAL TEST OF LEFT IDG CARRIED OUT I.A.W AMM 24-11-00-715-005. TEST PASSED AND AIRCRAFT RETURNED TO NORMAL