What was found
FLIGHT 5903) DURING CLIMB OUT OF STL RECEIVED AN IB FLIGHT SPOILER AND IB SPOILER CAUTION MESSAGE, AIRCRAFT RETURNED TO STL. REPLACED THE SPOILER/STABILIZER CONTROL UNIT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLIGHT 5903) DURING CLIMB OUT OF STL RECEIVED AN IB FLIGHT SPOILER AND IB SPOILER CAUTION MESSAGE, AIRCRAFT RETURNED TO STL. REPLACED THE SPOILER/STABILIZER CONTROL UNIT.