What was found
(CAN) DURING ENGINE SPOOL-UP IN PREPARATION TO TAKEOFF, NR 1 ENGINE EXPERIENCED MULTIPLE COMPRESSOR STALLS. AIRCRAFT RETURNED TO THE RAMP. ENGINE INSPECTED FOR DAMAGE AND F.O.D. NO DISCREPANCIES FOUND. FUEL PRESSURIZATION AND DUMP VALVE ADJUSTED. ENGINE RUN-UP TO CONFIRM OPERATION AFTER ADJUSTMENTS. ACCELERATION CHECK, CONFIDENCE CHECK, AND POWER LEVER RESPONSE CHECKED SERVICEABLE. AIRCRAFT RELEASED FOR SERVICE.