DualShock 3 - Unresponsive

Thank you for looking.
This is a genuine Sony PS3 controller (DUALSHOCK3).
[Color] Deep Red
[Model Number] CECHZC2J
[Condition]
Exterior: No noticeable scratches or dirt, and no stickiness on the analog sticks. It is in very clean condition for its age (please check the photos).
Operation: There is a malfunction where other buttons react incorrectly when the L3/R3 sticks are pressed down.
[Attention]
Due to the above malfunction, this item is being sold as **junk**.
Please only purchase if you are able to repair it yourself or if you intend to use it for parts.