Threshold Stasis 2 issue

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I just got a nice Threshold Stasis 2 that is in very good shape. it works nicely functionwise, the only issue is the LED level indicater:
when i just turn it on, the left channel LEDs will light all the way to the top and keep about 5 minutes then it will drop to 2 or 3 bottom LEDs (these 2 or 3 LEDs will stay and the others will follow the signal level). the right channel has no issue. the sounds level between the two channels have no different to my ear, I tried mono input so the signals are same also.

What is the problem? What is the first thing I shoudl check or replace? I hope I explained clearly. Apprecaite all helps.
 
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