What was found
WINDOW HEAT LT SIDE "OVERHEAT" LIGHT ILLUMINATED ON LANDING AS THRUST REVERSERS WERE DEPLOYED. LIGHT REMAINED ON DURING ROLL OUT & TAXI. PERFORMED QRH. LIGHT RE ILLUMINATED. ACFT GROUNDED. LT SIDE WHICH SHOWS AN ACTIVE "SENSOR FAULT". WHILE INSPECTING LT SIDE WINDOW HEAT SENSOR WIRES, FOUND LOWER AFT STUD BACKED OUT 3 FULL TURNS RESECURED SENSOR WIRE STUD & RETESTED LT SIDE WHICH NO CURRENT FAULTS BITE CHECKED OK REF MM 30-41-00. GROUND VERIFICATION OF ETOPS SIGNIFICANT SYS CHECKED GOOD.