been awhile since i messed with one of these, but i'm not sure what you did to redirect the audio... depending on the board set you have in there... if you had an external amp it should just be a matter of removing your amp wiring from the box and moving the audio from the CD player unit back on the the mainboard connector and hooking up speakers to the amp output. but if you used an external board like the background audio board to pull audio out, you shouldn't have to do anything but disconnect your amp and hook up speakers to the built-in amp.
be aware that when using the built-in amp, you are going to have to either use the built on volume control on the bottom of the box, or supply an external volume control.