As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - RECEIVED AN I/B SPOILERONS I/B FLT SPLRS MESSAGE. FOUND RT I/B MFS PCU MPE32 FAILED PCU JAM IN MDC. REMOVED AND REPLACED RIB MFS PCU IAW CRJ AMM TASK 27-62-01-000-801 A01 AND 27-62-01-400-801 A01 LEAK TEST GOOD, OPS TEST GOOD. RETURNED TO SERVICE.