What was found
RDU - FLT 5187 - ON FLIGHT FROM RDU/CHS, AIRCREW TURNED ON RT FLOW PACK AND SMOKE AND A BURNING SMELL WAS NOTED. EMERGENCY PROCEDURES WERE FOLLOWED AND IN-FLIGHT EMERGENCY DECLARED. AIRCRAFT RETURNED TO RDU AND LANDED WITH NO PROBLEMS. MAINTENANCE DEPLOYED FROM CLT/RDU AND FOUND RT AUTOTEMP CONTROLLER BAD, TEMP CONTROLLER DEFERRED TO MSL NR 03059802C. AIRCRAFT WAS RESTRICTED TO LT FLOW PACK ONLY. AIRCRAFT WAS REPOSITIONED TO CLT FOR MAINTENANCE. (X)