What was found
CLT - FLT 1952 EN-ROUTE FLL TO CLT. AT FL 330 AND .70 MACH, THE NR 1 ENGINE BEGAN TO HAVE MULTIPLE COMPRESSOR STALLS. THE ENGINE THRUST WAS REDUCED PER QRH PROCEDURE, AND THE COMPRESSOR STALLS CEASED. NO ENGINE EXCEEDANCES WERE NOTED. THE FLIGHT CONTINUED TO CLT. CLOSE TO APPROACH, ATC WAS ADVISED OF THE COMPRESSOR STALLS, AND ATC CALLED OUT THE EMERGENCY EQUIPMENT. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE. ALSO, REPLACED THE LEFT ENGINE PRSOV (PRECAUTIONARY).