Krell 200 amp, Krell KRC Preamplifier for repair

I’m in deep trouble, 6 months at local tech. He tried but failed.

My attempts to contact Krell without any success. Phone calls go nowhere, emails not responding. 
Im in NJ, anyone has any suggestions. 
For now I’m using Rotel 1570 integrated. 
Just bought amplifier PS 250BHK signature, maybe will give up K

rells all together if I like new amp. Just need to add another preamp.

Any piece of advice, recommendations appreciated very much.