As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OB SPOILERONS / OB FLIGHT SPOILERS CAUTION MESSAGE ON DECENT AFTER SELECTION TO DEPLOY SPOILERS / INTERROGATED MDC AND FOUND B1 CODE 007920, TROUBLESHOT IAW CRJ900 FIM 27-64-01-810-817-A01-PSA AND DETERMINED PCU MPE34 TO BE AT FAULT. REMOVED AND REPLACED THE RH OUTBOARD MULTIFUNCTION PCU SPOILER IAW CRJ900 AMM 27-62-01-000/400-801. LEAK CHECKS AND OP CHECKS GOOD.