What was found
DURING CRUISE, EN ROUTE FROM ROC TO CLT AT FL340, THE NR 1 ENGINE EXPERIENCED MULTIPLE COMPRESSOR STALLS WHICH LASTED APPROXIMATELY 30 SECONDS EACH. PER QUICK REFERENCE HANDBOOK, CREW REDUCED THRUST AND OPERATED AT THAT POWER THE REMAINDER OF FLIGHT. EGT REMAINED NORMAL. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE COMPLETED A BOROSCOPE INSPECTION OF THE NR 1 ENGINE. REMOVED AND REPLACED THE NR 1 ENGINE CIT SENSOR, VBV GEAR MOTOR AND THE 5TH STAGE BLEED AIR CHECK VALVE. PERFORMED TESTS OF VBV'S AND VSV'S WITH NO FAULTS NOTED. PERFORMED TRIM AND TAKEOFF POWER RUNS WITH NO PROBLEMS NOTED.