What was found
DURING ENG FIR TEST, #1 T. HANDLE DOES NOT ILLUMINATE W/ A LOOP (OVHT DET) FAULT LIGHT ILLUMINATED AND HANDLE NOT LIT. TEST W/ B OVHT DET SELECTED ILLUMINATED AS NORMAL. GROUNDED - YES. VERIFIED DEFECT. PERFORMED ALTERNATE DEACTIVATION REF CHAP 5. REMOVED AND REPLACE MW0325 HARNESS ON #1 ENGINE REF B737-800 AMM 26-11-02. OP CHECK GOOD. ALTERNATE DEACTIVATION PROCEDURES REVERSED. ETOPS GROUND VERIFICATION SUCCESSFUL. THIS CLEARS MEL 26-2B, CN 23022584. PLACARDS REMOVED. SEA MC JAKE NOTIFIED.