What was found
ON TAKEOFF AT ORD EN ROUTE FOR PHX, WHEN FLEX THRUST APPLIED HEARD A LOUD BANG WITH MOMENTARY STALL INDICATED ON ECAM, REJECTED TAKEOFF AND UPON CLEARING RUNWAY NOTICED NR 1 ENGINE N2 VIB AT 7.4, SHUTDOWN ENGINE AND RETURNED TO GATE. MAINTENANCE PERFORMED A VISUAL INSPECTION OF INLET AND EXHAUST AREAS AND FOUND NO APPARENT DAMAGE. INSPECTED 7TH AND 10TH STAGE BLEED VALVES AND FOUND METAL SHAVINGS IN 7TH STAGE AT THE 1 O'CLOCK AND 7 O'CLOCK POSITIONS. REMOVED AND REPLACED NR 1 ENGINE IAW T/C R5M71302, OPERATIONAL CHECK WAS GOOD.