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| Raise cover flap -1- in heat insulation mat -3- on the bulkhead -4-. |
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| Remove water drain valve -2- from bulkhead -4-. |
| Check water drain valve as follows to ensure it functions correctly: |
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| The water drain valve must not be stuck together. |
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| The heat insulation mat must not be deformed or damaged in the area around the water drain valve. |
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| The opening of the water drain valve flap must point downward. |
Note | When closing, the cover flap -1- must be flush with the heat insulation mat. If the cover flap -1- is pushed in too far, the water drain valve shutter flap -2- can get stuck. |
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