My #@%$ Cat Destroyed My ARC REF 5SE. Soliciting Suggestions.

Very sorry for your situation. I agree 100% with teo_audio. I've repaired amps, preamps, crossovers and other gear with printed circuit boards, built circuit boards, amps, preamps, and more. I've rebuilt traces, cleaned boards, repaired burned board sections, and more. I would be very hesitant to declare it irreparable without actually seeing the damage, though I would not pay $6k for the board.

Would you be OK with posting pics? You can PM me with them if you wish. I won't do the work, but could possibly offer another opinion that aligns with teo_audio, which might encourage you to seek out a willing tech. The cost is substantial, so I encourage you to not give up quite yet.

Also, although you didn't solicit veterinary advice, anzaanimalclinic provided excellent information.

I haven't seen it mentioned on this thread but cats definitely do not like being left alone for extended periods. Maybe the delay you encountered contributed to the cats behaviour
I was once told of a couple that went on vacation for two weeks (and presumably had a "cat sitter' for the duration)
When they returned from vacation the cat immediately jumped on their antique cabinet, looked them in the eye and proceed to pee all over it

What you need (what we all need at times)  is an old school tech with reasonable prices..  As of course they are rarer than hens teeth.   My only suggestion is to call Northridge Electronics in Simi Valley ,  CA   and talk to Tom.    He has had and has I suspect numerous service provider accounts with major players over the years and is qualified and he has always been reasonable.    I have shipped to him just for his service even though I had lived in a major metro area and there were repair shops there.    Obviously  7k is  just a bit steep.     Hopefully he has not retired yet as hes getting close . 

So sorry for you're loss.  The Ref 5SE can do amazing things to a system. 

Not so sure what your marital situation is but if you think about this the cat might have really done you a favor. Why not turn a bad situation into a great situation?

While the Ref 5SE is great, you now have the opportunity to purchase a slightly used 40 year anniversary or a Ref 10.   If cash wise that can not be done, consider the purchase of a banged up Ref 5SE, and swapping out the board into your existing case (assuming that the case is in great shape).   

Sorry to hear about your troubles, David. From another cat lover, I feel your pain.
To those who are offering advice/reasons for behavior, though well intentioned, you may want to ask David whether he would like/need the advice. I mention this because, if unwanted or unneeded, that advice can feel like a lecture.
To those who are basically saying, "It serves you right", you need to reexamine how you treat others. That kind of behavior is childish and uncharitable.
I agree with gktaudio & teo_audio. I’ve worked in a business that designs and manufactures laboratory test equipment for the past 30 years, and 20 of that was on the bench doing electronic, mechanical, and optical systems repair. I’ve seen it all, and there’s not much that can’t be fixed. Parts can be replaced (if available), repair wires can be run, parts/boards can be scrubbed. The challenge will be finding a shop that is willing to take on the task, and if you can, I can’t imagine this repair coming anywhere near 6k. I wish you the best of luck!