I am an original owner of a Krell KSA 250 , when my KSA-250 had a buzzing sound I drove from Massachusetts to Ct service department . They had to replace all the caps large and small . They actually said they never seen a KSA-250 with that many caps that needed replacement ! Being an original owner, willing to bring in the amp myself , and having an unusual number of capacitors gone bad , they gave me a break on the repair bill . Great service department , friendly service manager .
Best of luck with your repair