Agree, send to flannerys! I bought a b stock sig 600 first gen, sent to flannery, and he said there was no blackening what so ever anywhere, so mine was either not used much, or lightly used, was happy to hear that! He did his restore of caps, removed all the pacom caps and replaced with better , new light, checked everything out, clean bill of health, I should be good for 15-20 years now. Worth the. Money, as. Mentioned, the power does seem endless, no matter volume, or type of music, no clipping, whining, just gobs of uber clean power whenever it's called upon.
They are Carvers top amps, all should be judged by it.
Unless you WANT AND NEED NEW, look at the Sanders sound system MAGTECH. VERY SIMILAR LAYOUT. Very uncanny. Similar designs.
Stick with the sunfire fire until the humming starts, then its trade up time. Once she visits flannerys shop for her internal facelift, you will be good for another 20 years, as long as the hum don't start.
Mine is amazing!