NAD 1020 lost volume in one channel after recap

New to the forum, and new to the hobby.

I started working on a Nad 1020 (that I hope to pair with a nad 2040) I changed most of the caps and now I have lost volume in one channel (right) and when the volume is 3/4 up (on the right channel alone) I hear a scratch (distortion) left channel works perfectly.

My soldering skills are not great and I wonder if I did something there or if during the recap the volume got somehow damage.

What should I do next?
Grazie
 
Sadly we see this happen a lot... and you have really answered your own question... yes you did do something there.

Recheck all your work, look for solder splashes and blobs of solder that may have fallen off the iron.

Fault finding would begin with using a test signal source (signal generator or test tone off CD etc) and trace the signal from input sockets through the amp using an oscilloscope.