As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEPARTED DFW AND CLIMBING THRU FL250 SUDDEN AND REPETATIVE COMPRESSOR STALLS FROM ENGINE 2. NOTED 45-50 DURING STALLS. PASSENGERS REPORTED HEAVY VIBRATIONS AND FLAMES NO LIMITATIONS WERE EXCEEDED, NO EICAS MESSAGES ASSOCIATED. I LEVELED OFF AT FL250, DISCONNECTED AUTO THROTTLE, REDUCED ENG 2 TO? 60 N1 AND STALLS STOPPED. THROTTLE UP PAST 65 AND STALLS RETURNED. DECLARED MECHANICAL EMEDRGENCY FLIGHT RETURN TO DFW. NO INJRIES/ NO OVERWEIGHT LANDING. PENDING CORRECTIVE ACTION