What was found
DURING C-CHECK, FOUND LT UPPER HORIZ STAB LEADING EDGE HAD CORROSION IN 2 PLACES AT ATTACHMENT SCREWS, APPROX. XF=143 AND XF=153. REMOVED OLD REPAIR DOUBLER, FABRICATED NEW REPAIR DOUBLER FROM .063 7075T-6. TREATED, PRIMED AND INSTALLED IAW DER APPRVED ENGINEERING SKETCH A98-R16.