What was found
B-18702During flight from SIN to TPE, LH windshield was noticed smoke and scorching smell.The abnormality disappeared after switched off LH window heat functionC/A:1. Check found LH windshield lower bus bar terminal have poor contact, accordingly, the terminal was replaced.2. After replaced the terminal,the window heat function test normal IAW AMM 30-41-00.3. EON will be issued for one time inspection on 747-400 fleet. 4. Submmit the Service Difficulty Report to Boeing for investigation, and request Boeing to provide preventive action.