PSW1200 - Quits

I have and throughly enjoy my Polk Audio PSW1200. It quit producing sound thus I replaced the fuse, but to no avail. The green vertical LED is working and appears to pulsate when connected to system.

I purchased the unit from Crutchfield in VA approx. 2 yrs ago. Currently reside in Louisville, KY and somewhat at a loss where to turn for repair or other than fuse replacement...root cause of problem

sincerly miss the sub tones

John Fleming