Door Ajar Sensor Caused by Trunk

#1
On my 2010 Corolla S, my door open sensor is being displayed on my dash. After checking all the doors I found out it is my trunk since the trunk interior light stays on as well. I took it in to Toyota and they wanted $500 to fix this problem. Does anyone have any idea how I can fix this myself? It seems like a simple fix, since it is just the trunk sensor not working properly.

Any feedback would be great! $500 seems like to much!
 
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