As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTED FLAP ASSYMETRY WHEN FLAPS 30 SELECTED. ONE FLAP REMAINED AT 20. FLAPS CAME UP TOGETHER DURING GO-AROUND. FLAPS CAME DOWN NORMALLY FOR SUBSEQUENT LANDING. NO EICAS OR STATUS MESSAGE NOTED. EMERGENCY DECLARED. REMOVED AND REPLACED FLAP POSITION INDICATOR.