This was a rare and old monster of an amp. Back in the day, this was 400 wpc , 130 lbs, class A, $6500 for 1 mono amp. And he has 2 mono amps to fix.
https://www.audiokarma.org/forums/index.php?threads/did-i-just-scroe-nrg-class-a-momoblocks.615613/
https://www.audiokarma.org/forums/index.php?threads/did-i-just-scroe-nrg-class-a-momoblocks.615613/