7, Sab nraud to
1. Sealing kev laus lossis kev puas tsuaj
Exclusion method: Hloov lub foob
2. Kev sib txuas xoob ntawm qhov nkag thiab qhov hluav taws xob ntawm cov roj
Txoj kev cais tawm: Tighten screws lossis yeeb nkab txuas
3. Sealing nto sib tsoo
Exclusion method: Sib tsoo lub sealing nto
4. Cov xuab zeb qhov hauv lub plhaub sab nraud
Exclusion method: Hloov lub plhaub sab nraud
