As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AT FL210, RECEIVED "AILERON SYS 1 FAIL" EICAS MESSAGE. LEVELED OFF AT FL230 AND TOLD ATC TO STAND BY. FOLLOWED QRH AND TURNED OFF AILERON SYSTEM 1 AND SLOWED TO 250 KIAS. EMERGENCY DECLARED WITH ATC AND F/A PREPARED CABIN FOR EMERGENCY LANDING. LANDED WITHOUT FURTHER INCIDENT. MX TROUBLESHOT ACFT AND COULD NOT DUPLICATE FAULT. OPS CHECK GOOD IAW EMB AMM.