As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CORROSION IDENTIFIED ON SKIN PANEL ON HORIZONTAL STAB BOX ASSEMLBY INTERNAL SURFACES. FROM THE DETAILS PROVIDED, IT IS QUESTIONABLE IF F13 CORBAN OR DINITROL HAS BEEN APPLIED TO THE STRUCTURE. IT SHOULD BE SPRAYED ON THE STRUCTURE IAW DRAWING 85517021, SHEET 1.1, NOTE 15.