I finally received my Levinson 23.5 back from Pyramid Audio in Austin Texas. The left channel went out back in May, I got it packed up and shipped in early June, and got it back right before Halloween. They had some difficulty with the repair because my amp was a bit of a pain to get right.
The total cost was $3700 not including shipping to them. It was a huge pita and although I am overall happy, it is a more money than brains exercise.
If you are going to do this, only use UPS freight. I nearly had a disaster shipping to them using regular UPS but luckily I used a mega size Pelican hard case which was a $300 investment on its own. UPS freight guarantees it will ship on a pallet and not get rolled around on warehouse conveyor belts.
Like I said, more money than brains and a big investment in an old amp. But I love it.