As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L2 VIEWING WINDOW FROSTED OVER. ACFT GROUNDED. WHILE PERFORMING LT SIDE WINDOW POWER TEST, PLACED WINDOW HEAT TO ON AND DID NOT COME ON FOR 1 MIN. PRECAUTIONARY REPLACED WHCU. INSPECTED COIL HARNESS AND WINDOW SENSOR WIRING. ALL CKS NORMAL. REF WD 30-41-12. REMOVED AND INSTALLED LT SIDE WHCU REF MM 30-41-11. PERFORMED WHCU OPS TEST. TEST CKS NORMAL. PERFORMED WINDOW OPS TEST AGAIN. ALL TESTS REF 30-41-00. NO HISTORY IN 90 DAYS.