Audio Research LS9 volume control is not working..

My less than three years old, minimally used, Audio Research LS9 volume control is not working.

There was a power outrage in my area but I thought my Monster-Power HTS 3600 Power surge Protector would have prevent any damage. I guess not.
(http://www.bhphotovideo.com/c/product/395927-REG/Monster_Power_109096_HTS_3600_Power_Strip.html#specifications)

Pre amp volume control is not working after the power surge occured my area. When I power up, the sound volume level jumps in the middle range even with control knob in the minium level position.

I currently hooked to Rotel pre-amp without balanced mode.
Audio Rsearsch D400 solide state power amp is ok with Dynaudio Confidence2 speakers.

I tested my Audio Research LS9 pre amp to my friend's house with Rotel power amp and B&W 803 speakers.
Same thing. The volume level control knob doesn't work but the sound level jumps into the mid range.

Is this a common failure of Audio Research LS9 volume control? Anyone has a similar trouble?

Any recommand for repair services in NY/NJ metroplitan area?