What was found
DURING INSP BY MECH, A BLACK STREAK (FORE TO AFT) WAS NOTICED ON LT HORIZ STAB, THAT BOOT LOOKED BURNT ON L.E. EXAMINATION REVEALED THAT BOOT MUST HAVE SHORTED AGAINST L.E., BURNING BOTH BOOT AND HORIZ STAB CONSISTED OF NICKEL SIZE HOLE BEING COMPLETELY BURNT THROUGH. NO OTHER INTERNAL STRUCTURES WERE DAMAGED. BOTH BOOT AND L.E. SKIN WERE REMOVED AND REPLACED BY NEW COMPONENTS. LAST SCHEDULED INSP OF TAIL REVEALED NO ANNOMOLIES. AN INSPECTION OF STAB DE-ICE SYST WAS ACCOMPLISHED, INCLUDING SEQUENCE TIMER, WIRING, CIRCUIT BREAKERS, CURRENT LIMITER, TERMINAL BLOCKS, SYST SWITCH, AND CAUTION LIGHT. PILOTS REPORTED NO DISCREPANCIES. CIRCUIT BREAKERS AND CURRENT LIMITER HAD NOT BLOWN PREVENTING THIS MALFUCTION.