What was found
ETOPS SIGNIFICANT SYSTEM - ALL FUEL INDICATIONS ON RT TANK FUEL GAUGE DISAPPEARED. GAUGE CAME ON AT BLOCK IN. WIRE CONTINTUITY CHECKED GOOD FROM D2706C TO D4638P TO M1949 PER WDM28-41-22. FOUND IN TANK HI-Z TO SHEILD INSULATION RESISTANCE LOW & TU2, TU4, TU6 RESISTANCE READINGS LOW PER AMM 28-41-00. REMOVED AND REPLACED TU2, 4, 6 PER AMM 28-41-01 OPS CHECKED GOOD, LEAK CHECKED GOOD.