As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT HEARD LOUD NOISE FROM THE ENGINE COMPARTMENT. REMOVED STARTER GEN AND INSTALLED A SERVICEABLE TSO GENERATOR. RAN AC FOR 30 MINUTES AT GROUND IDLE AND 100 PERCENT RPM FOR 10 MINUTES WITH NO NOISE OCCURRING. REMOVED AND INSPECTED ENGINE CHIP PLUGS, CHECKED GOOD. REMOVED FUEL PUMP AND INSTALLED A SERVICEABLE FUEL PUMP. C/W A VIBRATION CHECK. VIBE CHECK GOOD. AC RETURNED TO SERVICE. (K)