Welcome to The Carver Site, @StevenP, so glad you found us!
Why stop at one? I keep my eyes open for another 600x2 to compliment the one I have. ๐
I think that a couple more things are on your wishlist..., like a Sunfire VTCC (Vacuum Tube Control Center) the matching Sunfire Preamp to your 600x2 amplifier...,
Again, welcome. BTW, we LOVE pictures. When you get your amp back, post some pictures of your system with those Polks, in the "Member's Systems" section.
...and now, curious minds want to know..., when you get your 600x2 back..., what it was your tech repaired..., it might help another member be on the look out for similar issue(s).