What was found
AT CRUISE, NOTICEABLE NR 1 ENG VIBE, VIBE DISAPPEARS AS THROTTLE REDUCED CLOSE TO IDLE, DECLARED EMERGENCY, LANDED. MX PERFORMED A/C VIBE MONITOR CHECK IAW T/C F2A77001, & PERFORMED POWER ASSURANCE CHECK PER T/C F5M71003, BOTH GOOD. SHOOK AILERONS, FLAPS, ELEVATORS, & AC PACK DOORS, NO DEFECTS NOTED. PERFORMED TEST FLT. DURING CLIMB NR 1 COMPRESS STALLED. MX FOUND 6TH STAGE COMPRESS WITH 4 BLADE TIPS MISSING & SEVERAL BLADES BENT. R & R NR 1 ENG, OPS CHECK GOOD. FOUND WEAR IN THE HPC ROTOR, AFT STATOR, COMBUSTION CASE &COMBUSTOR, BUT THIS DID NOT CAUSE STALL. STALL CAUSED BY FOD DAMAGE TO STAGES 6 THRU 9 OF HPC ROTOR. FOD DAMAGE ALSO NOTED TO VANES IN STAGES 4 & 5 OF HPC FWD STATOR, & STAGES 6 & 7.