alpine 9851-- fader quit working

[pluto 10+ year member]

Have a problem with fader control. everything has worked fine for last six months until today. Fader is set to run front speakers with a little rear fill. Now all speakers play with it still set for the front speakers. When I turn the fader for the rear speakers all speakers quit working. I have all speakers running from a jl-300/4. Hope this is just a wire come loose or grounding out and not the amp. Headunit was bought and installed at best buy. Is there any way I can check myself to see if it is the Headunit , Amp, Wiring ??? Can you guys offer any suggestions.

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[pluto 10+ year member]

Anybody?????????