Stay away from the nad

Apparently Djeng prefers complaining to strangers on the internet to contacting Nad to see if they’d warranty his broken 356. 

Call them.  Get a real live person on the phone.  Explain that you are a repeat Nad customer.  Be friendly.  Have your receipt that proves it's only a "couple of months" out of warranty as you've stated.  Ask if there is anything that they can do to cover this under warranty on a one time basis.  If they say no, politely ask to speak to a manager about this unfortunate situation.  Report back here with the results.

It meant to be advise not complaining. No help from nad.

Sorry for typo. "advice". Yes, I contacted nad and the first question was "is the unit still in warranty". When I said no I've got the answer "Sorry for the trouble". Any further conversation with them was over.

It sounds like you didn't politely insist on speaking with a manager.  It sounds like you haven't pursued the matter, but with a budget of over $4000 for a replacement, you won't miss the Nad.

 I had Denon replace a remote out of warranty.  I've had Paradigm replace a tweeter out of warranty.  I've had Nissan repair my Altima out of warranty.  All free.   I guess perhaps it's a skill one has to develop.

Just look at how many NAD products are sold on here alone as 'Factory Refurbished'...... Where there's smoke.........