As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5906 ORD TO CLE - DURING TAKEOFF ROLE, THE FLIGHT CREW RECEIVED A SPOILER TAKEOFF CONFIGURATION MESSAGE ON THE EICAS. AT THAT POINT THE CREW DECIDED TO ABORT TAKEOFF AND RETURN TO THE GATE WITH NO INCIDENT. MAINTENANCE FOUND NUMEROUS PROXIMITY SWITCHES CONTAMINATED WITH FLUID. MAINTENANCE CLEANED ALL INBOARD SPOILER PROXIMITY SWITCHES AND CONDUCTED AN OPERATIONAL CHECK OF THE SYSTEM WITH NO FAULTS FOUND.