As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PSP - FLIGHT 2580, DURING FLIGHT CONTROL CHECK THE MASTER CAUTION CAME ON FOR THE OUTBOARD SPOILERS (SPOILERONS AND FLIGHT SPOILERS). RETURNED TO THE GATE. MAINTENANCE REPLACED THE PCU. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.