B&K amp parts source

Hi All,

I have a B&K Ref 2220 which sounds very nice with the Thiel CS 3.5 speakers in my secondary system. However, the power on button has become unreliable, sometimes requiring dozens of presses to turn the amp off. I have repeatedly contacted ATI who aquired B&K and am told, " We have all their parts, but nothing is organized so we can't find it for you."
I had my local electronics shop call ATI, and they got the same response. My local tech commented that the power switch on my amp looked identical to ones he had seen on other B&K amps, so it should not be a rare part. What I am hoping you can help with is where, other than ATI, might I get one? Perhaps a dealer who stocked a lot of B&K amps and has one?
BTW my local tech, who I think is highly competent, cleaned and lubricated my switch, but the problem was not improved.
Thanks in advance!