Introduction
In this guide we will disassemble a flickering/non-working third brake light on a 2nd gen (2010-2018) Volvo S60 and repair it. To be able to remove the part you need to remove door gaskets, partially remove C pillar trim covers, and pull the headliner down little bit. The brake light slides out. In my repair the only problem was a broken solder joint on the LED strip circuitry. A very simple repair.
The official disassembly instructions request removing the B and C pillar trim covers, however I was able to complete the job by only partially removing C pillar trim covers. Official Volvo disassembly instructions are provided at the end of the guide as PDF documents.
Tools
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            Open the rear doors. Pull the rubber door gaskets down and release them partially. 
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            Do the same on the other side, too. 
 
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            Using a T25 torx screwdriver remove the screw inside the hole. 
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            Pry the trim panel away, you don't need to remove it completely. 
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            Do the same for the other side panel, too. 
 
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            Use a flat blade screwdriver and pry open the handle screw cover. 
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            Use an 8mm socket driver to remove both screws. 
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            Do the same for the other side, too. 
 
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            Using a flat trim removal tool, rotate the left headliner retaining plastic dowel 90 degrees clockwise and pull it out. 
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            Do the same for the other side, too. 
 
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            Gently pull the headliner down, try not deforming it. Pry open slightly. 
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            Gently pull the brake light assembly out and rotate it in place counter-clockwise to access the cable plug. 
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            Press the marked tab on the green plastic cable plug and remove it. 
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            Don't forget, the most difficult part during this operation will be reconnecting this plug. 
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            The cable is very short and it is better reconnect it with someone helping you. 
 
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            Start working on the brake light assembly. 
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            Using a small flat-blade screwdriver push the tabs to release the LED strip circuitry. 
 
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            Push with fingers from the other side and the plug connector. 
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            Prying the long edges of the plastic apart helps, too. 
 
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            Here the ground stud had a broken solder joint. 
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            Scratch the surrounding ground plane to increase soldering area and apply flux. 
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            Solder the stud back properly. 
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            While you are here, apply flux and fresh solder on the other stud, too. 
 
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            The rubber light shield does not stay put, so use a strong flexible adhesive to glue it back. 
 
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To reassemble your device, follow these instructions in reverse order.