As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HYDRAULIC SYSTEM, PRE-DEPARTURE, SPOILER FAIL EICAS MESSAGE APPEARED. MAINTENANCE REPLACED RELAYS K0030 AND K0031, BUT THE MESSAGE STILL PRESENT. REPLACED SPOILER CONTROL UNIT WITH SERVICEABLE UNIT AND PERFORMED OPS CHECK. THE MESSAGE DISAPPEARED AND OPS CHECKED GOOD.