Agree with posts above that major overhaul be done by the factory. I own ARC gear and use a local ARC authorized tech only for basic soldiering type repairs (e.g., replacing burned bias resisters). But ... if something was really wrong with any of my ARC units, I would have no hesitation in sending them back to the factory.
Don't know how Krell gear is boxed, but ARC uses double boxing with a 1" Styrofoam liner in between the boxes. When I bought or sold ARC gear, I shipped by FedEx. Been lucky. No problems. But I ship to and from a local FedEx office. That way FedEx can't deny shipping condition on the shipping "to" or "from."
Good luck.
Don't know how Krell gear is boxed, but ARC uses double boxing with a 1" Styrofoam liner in between the boxes. When I bought or sold ARC gear, I shipped by FedEx. Been lucky. No problems. But I ship to and from a local FedEx office. That way FedEx can't deny shipping condition on the shipping "to" or "from."
Good luck.