R36 gain control potentiometer


I have looked for other posts with same problem but could not find exact issue. 
Problem: Gain control (volume) goes from medium to loud but does not turn volume completely down. I've check installation and soldering and was able to adjust and align as per instructions. The QCX works flawlessly other than that. Just wanted some advice before I install into case. This is my very first kit build, new to electronics.

Thank you, 

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