As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED THAT AFTER START ENGS APPEARED THE EICAS MSG LT BACK UP GEN OUT OF SERVICE. PERFORMED FIM 24-20 TASK 811 PROCEDURE, SHOWING FAILURE CODE 24-46000. THE BACK GEN WAS DEFERRED IAW MEL 24-25-01A CAT C. REPLACED THE BACK GEN IAW AMM 24-25-01, TESTED CORRECT.