As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACKS WERE FOUND ON THE FRAME WHERE IT RIVETED TO THE TAIL CONE SKIN. CRACKS WERE ALSO FOUND UNDER THE UPPER AFT ECU MOUNT. INSTALLED REPAIR KIT P/N 117-SB20-101-3.1 ACCORDING TO SB BK117-20-101. INSTALLED A REPAIR DOUBLER ON TAIL CONE. SHIMMED ECU TO AVOID ANY PRELOADS ON MOUNTS.