As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MOMENTARY POWER INTERRUPTION INFLT. EMERGENCY LTS FLICKER. INSTS FLICKER. HAPPENED IMMEDIATELY AFTER T/O AND TWO MORE TIMES IN CLIMBOUT. APU STARTED AS PRECAUTION. NO EPCU FAULTS, VSCF FANS TEST OK. REPLACED EPCU PER MM, NEEDS FUNCTIONAL TEST TASK 24-21-03-720-801. C/W FUNCTIONAL CHECK OF EPCU/ELECT SYSTEM PER M/M, ALL INDICATION AND OPERATION NORMAL.