As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT # 716,BUF-BOS.(EMERGENCY DECLARED). DURING CLIMB AT APPROX 12000FT ENGINE 1 BEGAN SURGING BETWEEN 56% - 79% N1 . UPON LEVEL OFF AT 19,000 FEET, THE SURGE STOPPED. ONCE WE BEGAN DECENT IT SURGED ONE MORE TIME, THEN WAS NORMAL THROUGHOUT LANDING ROLL.; SEE DEFECT # 3287925 FOR FMU REPLACEMENT. ENG #1 FADEC CONNECTORS P3 + P4 DISCONNECTED FOR TROUBLESHOOTING. RECONNECT P3+ P4 ON #1 ENG FADEC . REMOVED #1 ENG FMU REF DEFECT LP 3287923 ITEM #1. INSTALLED #1 ENG FMU LEAK CHECKS OK REF 73-00-00-050-804 LMM