What was found
WINDOW HEAT LT SIDE "OVERHEAT". ACFT GROUNDED. PERFORMED WHCU BITE TEST FOR L-2 WINDOW, SHOWS A SENSOR FAULT. SWAPPED WHCU 3 & 4 FOR TROUBLESHOOTING, NO HELP. SWAPPED BACK WHCU 3 & 4 TO ORIGINAL POSITION & SECURED. PERFORMED RESISTANCE TEST OF L-2 WINDOW TEMP SENSOR. IN SERVICE SENSOR WAS OPEN. VERIFIED SPARE SENSOR RESISTANCE GOOD IAW TABLE 2. SWAPPED TERM D LUG TO SPARE SENSOR. PERFORMED WINDOW HEAT SENSOR, SYS OP TEST IAW AMM 30-41-00-710-801. OPS TEST GOOD. GROUND VERIFIED, OP CHECK OF WINDOW HEAT CONTROL SYSTEM, COMPLETED. L-2 WINDOW HEAT OVERHEAT LIGHT IS NOT ON. FIM REF 30-41, TASK 801. RESISTANCE REF AMM 30-41-21-760-801.