If I had owned Arc gear at the time I would have had to ship the amp back at Great expense and then wait months for the return after service, also at great expense. I always thought of Arc gear as I do Ferrari. Stunning to look at definitely some cachet to owning one and when properly tuned absolutely thrilling to drive. The flip side is that 36,000 miles on a Ferrari is considered high mileage and an engine rebuild is eminent. This is why I own the gear that I do.. and drive a Porsche.
There is another thread here somewhere in which I contributed on the issue of getting tubed gear repaired. The truth (a loaded word as the "truth" is often subjective and anecdotal and in this context regional too) is that most major metropolitan areas have musician-based amp repair shops. My city of Columbus OH does. It is amazing but true that a good guitar amp repair tech can make easy work of repairing an ARC amp if a schematic is provided. ARC will provide the schematic-don't let anyone tell you otherwise, particularly if you are the original owner.
Guess what? Tube amps are far more easy to repair than solid state amps. Truth. Generally speaking. The vast majority of tube amps are built using fairly simple circuit designs.
Someone up above said of Ayon;
land microprocessor controlled for each tube ,, the others just average all tubes not accurate at all ,when you gets bad tube a led goes on ,you just replace that 1 tube hit a button and recalibrated the amp
I have no idea what a "land microprocessor" is, Mr. Google suggests it is a Land Grid Array unless this guy means a relay manufactured by Land Instruments but either way, this is the kind of thing that a tech can not fix. Only replace.
Speaking of pride of ownership, my AmpsandSound Nautilus amp is not only built like a tank but it is built using a 60 year old circuit design with turrets. Talk about simple to repair!