Schematics for Eden WT-1000?

[KM22]

Hi Folks,

Trying to fix up a WT-1000 with one noisy / blown channel. Can get signal through to speaker but no real gain and all distorted. Anyone know what typically goes in
these amps - pre-amp or power amp? Would appreciate schematics to speed up the troubleshooting....thanks!
--kurtm22