As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) VERTICAL STABILIZER REMOVED TO ACCESS FUSELAGE SIDE SKIN REPLACEMENT (COSMETIC) WITH STABILIZER ON WORKBENCH, VISIBLE ACCESS TO INTERNAL STRUCTURE REVEALED CONSIDERABLE SURFACE CORROSION EVERY WHERE INTERNALLY. EXTERNAL UNIT LOOKS FINE. RECOMMEND REMOVAL OF VERTICAL AND HORIZONTAL STABILIZERS ON A REGULAR BASIS. IE. 400 HRS/5 YEARS.