Rega Elicit Mk2 volume control issue

Hi there. I have enjoyed a fine Rega Elicit mk2 amplifier for several years. However, recently I noticed that at a certain position of the volume control (or rather the LED track, as the knob has no fixed position) the sound from the left channel disappears, if I turn the control knob (or remote control) a few clicks clockwise the sound reappears, although it is slightly muffled. I checked different inputs, different sound sources - the problem does not disappear, the sound from the left channel disappears exactly in this position of the LEDs. I need your help.
 
Perhaps a bad solder joint like in this thread?
 
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