As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPOILER FAULT AND SPEED BRAKE FAIL IN FLIGHT AT FL310. RAN QRH AND IT WENT AWAY. ABOUT 5 MINUTES LATER, SAME MESSAGES REAPPEARED AND QRH WAS RUN AGAIN. EMERGENCY DECLARED. C/W FIM TASK 27-03-00-810-92D-A, PERFORMED RETURN TO SERVICE TEST IAW EMB 170 AMM 27-00-00-070-801-A/200. OPS CHECK GOOD. NO EICAS MESSAGES, FOUND TO BE TRANSITORY CONDITION OF THE FLIGHT CONTROL SYSTEM.