Tail light issue

[Fredriksen]

The right lamp is not working, sometimes it starts but not very often, is there a simple trick to fix it? Or do I have to replace the whole thing?
https://i.postimg.cc/7L2cpc5Y/temp-Image-IOen-UU.avif (https://postimages.org/)

[TexasDfwS4]

Check connection and spray with contact spray.

[white fish]

check the connection sometimes water get it there