I posted a thread a couple of weeks back asking about good places in Chicago to get equipment repaired. Many TBers recommended Midtown Instrument Rentals and Repair. I took my GK800 RB there and I could not be more pleased. They repaired the amp quicker than they promised, although they did state they had the part in stock, and for less $$$ than the minimum I had expected. Thanks to everyone that posted on the other thread. If you ever need equipment repaired in the Chicago are, I highly recommend this place.