I always pluck the light bulb to see if one of the filaments is broken. If not then rub the connection points on something like wood or paper, or cardboard to clean them up. Also check the socket to make sure the bulb is correct for the socket and twist it a few times after you reinstall it to get a good ground connection. Might not be a bad idea to catch the dampness and corrosion before it gets to the other bulbs.
regards
Mech
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