As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 453, DURING TAXI OUT, THE NR 1 GENERATOR TRIPPED OFF. MEL PROCEDURES WERE FOLLOWED AND POWER WAS TRANSFERED TO THE APU. DURING CLIMB OUT, THE APU FLAMED OUT. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DEPARTURE. AN UNEVENTFUL LANDING WAS MADE. REMOVED AND REPLACED THE NR 1 ENGINE CSD IAW AMM. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (K)