What was found
OPEN - ETOPS SIGNIFICANT SYSTEM - LEFT WINDSHIELD HEAT ECAM ILLUMINATED PRIOR TO ENTERING ETOPS AIRSPACE. RETURNED . BITE OF WINDSHIELD HEAT CONTROLLER NR 1 FAULTED CLASS 1-L WINDSHIELD SENSOR (3DG1) WINSHIELD HEAT CCONTROLLER NR 1 (2DG1) FAULT SWAPPED CONTROLLER STILL HAD FAULT ON NR 1. TROUBLESHOT PER TSM 30-42. FOUND SENSOR NR 1 BAD, SENSOR NR 2 & SENSOR NR 3 RESISTANCE CHECKED GOOD. SWAPPED TO SENSOR NR 2 PER TSM, STILL HAD CLASS 1 FAULT. WINDOW RESISTANCE CHECKED OK. REMOVED YELLOW WIRE NR 3042-0159 FROM PIN X OF T/B 30IVT. NO ECAM MESSAGE AND ONLY HAD CLASS 3 MESSAGE. REINSTALLED CONTROLLER BACK TO ORIGINAL POSITION. COMPLIED WITH ER/A 499510-14 REV. ORIG. PERMANENT REPAIR REQUIRED WITHIN 10 DAYS,