Introduction
If your YCCTEAM YCC-SW4001 shoulder buttons (L, R, ZL, and ZR buttons) have debris under them, are broken, or are not functioning properly, you can follow this guide to clean or replace them.
The shoulder buttons are used as inputs for the controller and have different functions across different games. This guide requires taking out an extra ZIF connector compared to the other guides. It is not dangerous, but the ZIF connector is very thin and could break with too much force.
To take out the ZR and ZL buttons, a metal rod needs to be taken out. This is the most difficult part, and while it doesn't require any technical skills, it is difficult to maneuver the rods out from under the buttons.
Tools
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Use a Phillips #1 screwdriver to remove the three 9.15 mm screws from the back of the controller.
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Isolate the front cover.
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Flip over the front cover and remove the four 5.77 mm screws from the back of the front cover using the Phillips #1 Screwdriver.
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Remove the L button by hand.
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Flip the shoulder buttons attachment and look at the metal rods.
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To reassemble your device, follow these instructions in reverse order.