As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CREW REPORTED THE NR 2 ENGINE EXPERIENCED 5-6 COMPRESSOR STALLS AND VIBRATION AT FL 250. THE ENGINE THRUST WAS REDUCED TO IDLE AND AN EMERGENCY WAS DECLARED. THE AIRCRAFT LANDED AT BOS SAFELY WITH NO FURTHER INCIDENTS. REPLACED NR 2 ENGINE IAW WORK CARD 26L40071004. ALSO,THERE ARE SLIVERS OF METAL HOLDING OPEN THE BLEED VALVE. LOSS OF HPC STAGE 7 BLADE DUE TO LACK OF DAMPER WIRES INSTALLED IN THE ENGINE.