My dome light unit fell down and my sun visor is not able to hold itself upright.
The sun visor has no serviceable parts and would need to be replaced if it is unable to stay in its stowed position. If the mounting hardware on the dome light is damaged then the dome light assembly will need to be replaced. You may want to enlist the help of a mechanic, such as one from YourMechanic, inspect the parts in question and make the necessary repairs.
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