As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER POWER UP NR 2 FMC DISPLAY FLASHED FROM DIM TO BRIGHT FOR ABOUT 10 MIN UNTIL AIRCRAFT HIT SOME BUMPS ON THE TAXIWAY. AFTER WHICH THE DISPLAY DID NOT FLASH. NO PREVIOUS HISTORY LAST 60 DAYS. GROUND VERIFICATION CHECKS OF FMC & CDU TEST NORMAL REF AMM 34 61 00 AND 34 61 01. SEAMC ETOPS NOTIFIED.