Some Input gains are lower by 10 db on input

Hi,
I have an issue with my console. I have had a stereo input setup on the console rear input of my avantis in 9/10 since a couple weeks the left channel (9) is lower by 10dB. I tried to release the stereo and go with dual mono but it is the same. Plugin the same source or my signal generator to another stereo pair is correct, no difference. Is there a way to calibrate the input or is there a technical issue on the board. Thanks fo any suggestion.
Paul

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hi friends,

It’s only because your preamp ar not the same.

Solution :

Unlink the stéréo chanel et go to preamp section and put the gain to 10 after go to the preamp 10 and put the gain to 10 after go to stéréo to link your 9 and 10 chanel to a stéré chanel and done your level meter are the same L and R