Hello,
There are 4 of the 5201 op-amps that need to be replaced with the NJM2121D op-amp. The part number below is Mouser part number if you can order from them. They are only .65 cents (US) apiece. So a very cheap improvement. When you replace them you may have to go through a reboot procedure. Once they are replaced and you power up your amp, if the three LED's on the front panel light up and stay on, press the store button once, the green channel 1 LED should light up, then press CH2 and confirm it's LED lights, then press channel 3 and confirm it's LED lights. Then plug in an play the amp and test all the channels. I think it is a worthwhile improvement because to me, every little bit you can get out of an amp, I want!
Norm
513-NJM2121D
http://www.mouser.com/ProductDetail/...m91Zi9MiXkfmj0=