What was found
DEN - RECEIVED A INBOARD FLIGHT SPOILERS AND INBOARD SPOILERONS CAUTION MESSAGE WHEN FLIGHT SPOILERS WERE DEPLOYED IN FLIGHT. ON LANDING AFTER TOUCHDOWN, THE RIGHT INBOARD SPOILER DEPLOYED BUT THE LEFT DID NOT. MAINTENANCE INTERROGATED THE MDC AND FOUND A L IB MFS PCU FAILED PCU JAM MESSAGE. CLEARED BY SERVICE LETTER CRJ-700-SL-27-052D. NO OTHER FAULTS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.