As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 1000 HOUR AIRFRAME INSPECTION FOUND CORROSION AT THE TAIL BOOM AFT RING FRAME REINFORCEMENT WHERE SERVICE BULLETIN SB EC135-53-030 WAS PERFORMED. THE CORROSION HAS MITIGATED UNDER THE REINFORCEMENT P/N L535H2100202. REPLACING THE TAIL BOOM.