How do you fix the legs (not jammed, worse)?

The legs on my WowWee CHiP began jamming frequently after an update. However, what someone did to fix it eventually broke the rear legs and made them limp when the motor is in certain positions. It cannot get itself up without help, as the legs collapse under it with a *click* when it tries. I am not going to describe what it may look like when this happens. I can easily move the legs into the correct position when they go limp, and when they do not move the legs at all, you can only hear the motor whirring as it moves into its place. Can anyone fix this?