As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK / DECLARED EMERGENCY / INFLIGHT SHUTDOWN. NR 1 ENGINE FAILURE ON CLIMBOUT OF SMF, NOTICED BURNING BIRD RESIDUE SMELL. POSSIBLY AS A RESULT OF BIRD STRIKE OR FROM PREVIOUS FLIGHT. APPROX 4500' MSL NR 1 ENGINE MADE LOUD BANGING NOISE. REMOVED AND REPLACED NR 1 ENGINE PER MT.