Ask help on PASS X150 bias setting

[aakkjj1999]

few months ago i bought an X150 and it all performs well with my TAD 500. but these days i found the left channel is hotter than the right channel.
after measuring the voltage across the 0R47 source resistor, I found the right channel is about 30mV and left is 38mV in average.

get into headache now, which one is closer to the factory setting?>

anyone can help me out?>😕😕😕

 

[Zen Mod]

before Papa chime in with exact answer , you can always take universal approach - bias it up to 50C (long term) on heatsinks