Help. No reverse lights!

I need to pass a safety and my reverse lights aren't working. I've put in new bulbs and even the carriers. I tested them on my buddies car and they worked but not on mine. The couster is telling me both sides are out and they are.. What fuse should I check? I checked inside the snorkel coming from the trunk briefly and couldent see any damaged wires. How do I tell if a fuse is gone after I've checked as well.





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