As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL 4 EMERGENCY LIGHT POWER UNITS FAIL FUNCTIONAL CHECK WITH RUN TIME OF LESS THAN 15 MINUTES. C/A COMPLETE: REMOVED AND REPLACED ALL 4 EMERGENCY LIGHT POWER SUPPLIES, REF EMB AMM 33-50-01. OPERATIONAL CHECK BEING PERFORMED ON WP H7673 TASK CARD NUMBER 2735 TASK NR 7.