As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RT STABILIZER END RIB FOUND TO HAVE INTERGRANULAR CORROSION WHERE IT ATTACHED TO THE FORWARD RIB. CORROSION IS ON THE UPPER INSIDE CORNER OF THE RIB AND ONLY CAN BE VIEWED USING SMALL MIRROR THRU THE LIGHTENING HOLE OF THIS RIB JUST IB OF THE RUDDERVATOR BALANCE WEIGHT.