What was found
WHILE AT FL 310 I NOTICED L OIL LOW. BEGAN MONITORING OIL INIDCATIONS. EVENTUALLY RECEIVED A L ENG OIL PRESS WARNING MESSAGE. FOLLOWED CRJ 900 QRH 1-20 AND 1-22 AS DIRECTED. SHUTDOWN LEFT ENGINE IN FLIGHT AS DIRECTED BY QRH. REPLACEED OF LT ENGINE C SUMP INNER AND OUTER OIL SCAVENGE LINE SEALS, GRAFOIL SEAL ON C SUMP REAR WALL, GRAFOIL SEAL FOR C SUMP BLIND CAP, GRAIL SEAL FOR C SUMP COVER. PERFORMED OIL CONSUMPTION RUNS TEST ALL TEST PASSED NO FURTHER DISCREPANCIES NOTED AT THIS TIME. NO OIL USED DURING OIL CONSUMPTION TEST