As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO BOS DUE TO RIGHT ENGINE COMPRESSOR STALL ABOUT 4000' ON DEPARTURE. THE AIRCRAFT LANDED SAFELY AT BOS AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND EVIDENCE OF BIRD STRIKE IN THE RIGHT ENGINE AND ACCOMPLISHED A BORESCOPE INSPECTION. MAINTENANCE FOUND MULTIPLE STAGE 1 HPC BLADES WERE BENT BACK AND 2 HAD TEARS. MAINTENANCE WILL BE REPLACING THE ENGINE. MAINTENANCE REPLACED THE ENGINE PER TASK CARD 26L40071001.