When you run into this is pretty well trial and error. At least the ground is marked also the online manual is easier to read. I'd start with the speaker out and the cables labeled R and L coming from the case. Could also google the case and hope you find something
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.