As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)OVER THE PAST SEVERAL DAYS, THE ENGINE HAD EXPERIENCED REPEATED SURGES. AFTER A LENGTHY TROUBLESHOOTING, THE PROBLEM WAS RESOLVED BY CHANGING THE FCU. THIS PARTICULAR UNIT HAD BEEN INSTALLED ONLY THRE E DAYS PRIOR TO THE ONSET OF THE SURGING.