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I currently have 3 amps connected to one mixer. All you need is to check where your amp is currently plugged into the mixer. now get yourself 2x RCA two way splitters at your local music shop (ie. One male to 2 female)split the channels from your mixer input, and an extra amp can be plugged into the spare plugs
This mixer (like all current Pioneer models) is built using "bucket" construction, i.e everything is installed from the top into the bottom case which has the four sides and bottom all pressed from a single piece of steel so what ever you need access to needs to removed from the top.
The first thing that comes to mind is that these units usually use op-amp ICs for buffers on the output lines. These ICs are either defective, or you have lost one of the power supplys. In any case, this is not a simple thing to trace without some test gear. I suggest that you bring this to an audio repair shop. If the ICs are defective, they cost less than $1 each and you will need at least 2.
As far as I'm aware there is no way to record to just one of the stereo paired tracks (channels) on the 2488. There are individual mono tracks underneath those channels, but they are controlled with one fader and can only be recorded to in stereo. They are designed to be used for recording stereo sources and stereo bounces. You can however record to any of tracks 1 to 12 and then move (assign) that track to say track (channel) 13 or you can clone any single track to any other track (channel).
The term track can be misleading on the 2488. It might be easier to refer to the 1-24 fader controlled 'tracks' on the 2488 as 'channel strips' and refer to each of the 250 virtual 'tracks' on the 2488 as 'tracks'. You can assign any of the 250 virtual tracks on the 2488 to any of the channel strips. So you have 250 tracks available, but can only work with 24 of them at a time. The stereo pairs just offer some extra convenience when working in stereo. They allow you to control the volume of two tracks with one fader making working with stereo easier.
Channels 1 and 2, 3 and 4, 4 and 6, ...11 and 12 can also be linked as stereo pairs and will be controlled with the fader of the odd numbered (first) track when linked.